You can suffocate if you leave a fan on while you sleep (you can't)
Urine is sterile (it's not)
Highways have straight segments so that airliners can land on them in emergencies (they don't)
You should drive at a normal speed in low-visibility weather so the car behind you doesn't hit you (you should slow down)
You can suck out the venom from snake bites (you can't)
Men think about sex every 7 seconds (they don't)