Not as in urban myth or conspiracy theory, but general everyday thing that’s taken as fact by the most people despite being complete bollocks.
Keep hearing people going on about some cats and dogs being hypoallergenic. Utter nonsense. Some shed less hair, that’s it. Happy to help.
Shoot…
Honorary mention to those little bottles of yoghurt people pay about £6 a pack for. They’re not doing you any harm, and if you get some sort of placebo effect from thinking you’re taking something gut-healthy every morning, good for you.
Meditation. Nope.
“Don’t stick anything in your ear that is larger than your elbow”
You can ‘clean’ your bumhole by dragging paper across it
Fan Death
That dairy cows actually like being milked, because they have lots of excess milk for some reason that they need to be relieved of.
Cup of tea cools you down
Adults need 2000 calories a day
Opening windows when it’s hot outside cools the inside of the house down.
Covid #scamdemic
If you’ve been soaking, you’re still a virgin
That browning meat in a pan ‘seals the juices in’. Obvious nonsense.
Apple cider vinegar fuck off mate
Not a myth, more a trope in TV & film
Obviously it happens on occasion but if you were to believe Hollywood, 98.5% of couples get pregnant from having sex once
Er, nope
Swimming too soon after eating will cause your stomach to cramp and you will drown to death.
Similarly, if you believe Grand Designs, 98.5% of couples get pregnant from building a house.
Another Grand Designs myth is that you can just “find” £100k to finish your glass box house. Meanwhile back in the real world, if I run out of money half way through my grandiose vanity project house, it stays half finished because there’s no way I’m magicking up that kind of money, being a normal person with non rich parents.
What happened to this one - was so prevalent when I was a kid and then just disappeared at some point?
Our kids have Wednesday swimming lessons shortly after school, so every week I’m whisking them into the car and stuffing them full of snacks as they are always starving before almost literally throwing them into the deep end 
And… foreplay and all the other fun stuff isn’t required. Just straight into the deed without a pause