--- title: Petrol stations, pools and things that go bang — a lesson of Mova's school · trees and pragmatics description: «Petrol stations, pools and things that go bang», a lesson of the myths course of Mova's primary school, sentence by sentence with dependency trees and pragmatics. It begins: Dad snaps "Phone off!" at the petrol pump, your big cousin swears the pool water turns red if you wee, and Ella says a shark --- [Mova](https://md.mova.elamur.ai/free/en/) · [this page in HTML](https://mova.elamur.ai/free/en/corpora/school/myths/23-petrol-stations-pools-and-things-that-go-bang/) [home](https://md.mova.elamur.ai/free/en/) / [corpora](https://md.mova.elamur.ai/free/en/corpora/) / [school](https://md.mova.elamur.ai/free/en/corpora/school/) / [Myths](https://md.mova.elamur.ai/free/en/corpora/school/myths/) / Petrol stations, pools and things that… # Petrol stations, pools and things that go bang Lesson 23 of the myths course of Mova's primary school: 18 sentences, each with its syntax tree and pragmatics. The lessons are written for Mova, and their agreed trees are part of Mova corpus 0.4 (CC BY-SA 4.0). How Mova does on its tests: [the lesson at school](https://md.mova.elamur.ai/free/en/school-run/myths/23-petrol-stations-pools-and-things-that-go-bang/). - [0](https://md.mova.elamur.ai/free/en/corpora/school/myths/23-petrol-stations-pools-and-things-that-go-bang/0/) — Dad snaps "Phone off!" at the petrol pump, your big cousin swears the pool water turns red if you wee, and Ella says a shark once swam into the hotel pool through the pipes. - [1](https://md.mova.elamur.ai/free/en/corpora/school/myths/23-petrol-stations-pools-and-things-that-go-bang/1/) — Safety myths are tricky because some are made up, some are true, and some give good advice for the wrong reason; laughing at all of them could get someone hurt. - [2](https://md.mova.elamur.ai/free/en/corpora/school/myths/23-petrol-stations-pools-and-things-that-go-bang/2/) — Gran's "never mix bleach with other cleaners" is completely true: some mixtures give off poisonous gas. - [3](https://md.mova.elamur.ai/free/en/corpora/school/myths/23-petrol-stations-pools-and-things-that-go-bang/3/) — "Get out of the pool when there's thunder" is true too. - [4](https://md.mova.elamur.ai/free/en/corpora/school/myths/23-petrol-stations-pools-and-things-that-go-bang/4/) — But a dropped penny can't kill, there's no magic dye for wee, and no shark can squeeze through pool pipes. - [5](https://md.mova.elamur.ai/free/en/corpora/school/myths/23-petrol-stations-pools-and-things-that-go-bang/5/) — The smart move is to sort them: "Is it true? - [6](https://md.mova.elamur.ai/free/en/corpora/school/myths/23-petrol-stations-pools-and-things-that-go-bang/6/) — Is the advice still good? - [8](https://md.mova.elamur.ai/free/en/corpora/school/myths/23-petrol-stations-pools-and-things-that-go-bang/8/) — There is no confirmed case of a mobile phone setting petrol alight at a pump; most fires at pumps start from static electricity (the charge that builds up on you and gives a little spark or zap), for example when someone gets back in the car and then touches the nozzle. - [9](https://md.mova.elamur.ai/free/en/corpora/school/myths/23-petrol-stations-pools-and-things-that-go-bang/9/) — Petrol stations still ask people not to use phones at the pump, and you should follow their rules; a phone also distracts people near fuel and cars. - [10](https://md.mova.elamur.ai/free/en/corpora/school/myths/23-petrol-stations-pools-and-things-that-go-bang/10/) — No chemical exists that turns pool water red around someone who wees; the story is told to stop children doing it, and weeing in a pool is still unclean and unfair on other swimmers. - [11](https://md.mova.elamur.ai/free/en/corpora/school/myths/23-petrol-stations-pools-and-things-that-go-bang/11/) — A shark could not get into a hotel pool through the pipes, which are narrow, have filters, and carry chlorinated fresh water (cleaned with a chemical called chlorine), not sea water. - [12](https://md.mova.elamur.ai/free/en/corpora/school/myths/23-petrol-stations-pools-and-things-that-go-bang/12/) — A penny dropped from a skyscraper slows down in the air and tumbles; it would sting but would not kill, though dropping heavier things from a height can be deadly. - [13](https://md.mova.elamur.ai/free/en/corpora/school/myths/23-petrol-stations-pools-and-things-that-go-bang/13/) — Being in water during a thunderstorm is dangerous, so you should get out of an outdoor pool at the first thunder and wait until the storm has passed. - [14](https://md.mova.elamur.ai/free/en/corpora/school/myths/23-petrol-stations-pools-and-things-that-go-bang/14/) — Static shocks from a trampoline can make your hair stand up and give a little zap, but they are harmless. - [15](https://md.mova.elamur.ai/free/en/corpora/school/myths/23-petrol-stations-pools-and-things-that-go-bang/15/) — Never mix bleach with other cleaners: some mixtures make poisonous gases. - [16](https://md.mova.elamur.ai/free/en/corpora/school/myths/23-petrol-stations-pools-and-things-that-go-bang/16/) — Mints dropped into cola make a fizzy fountain and a sticky mess, not an explosion; a bottle with its lid screwed on is different and should never be used. - [17](https://md.mova.elamur.ai/free/en/corpora/school/myths/23-petrol-stations-pools-and-things-that-go-bang/17/) — A phone charger in bed will not electrocute you (give you a deadly electric shock), but a phone or charger under a pillow or duvet can overheat and start a fire, so charge it on a hard surface. - [18](https://md.mova.elamur.ai/free/en/corpora/school/myths/23-petrol-stations-pools-and-things-that-go-bang/18/) — Holding your breath does help you float, because air in your lungs makes you lighter for your size. - ← previous: [Food on the floor and kitchen rules](https://md.mova.elamur.ai/free/en/corpora/school/myths/22-food-on-the-floor-and-kitchen-rules/) - next →: [School legends](https://md.mova.elamur.ai/free/en/corpora/school/myths/24-school-legends/) - ↑ back to [Myths](https://md.mova.elamur.ai/free/en/corpora/school/myths/)