Don't ride your bike with your shoe laces untied or else they'll wrap around the pedals until your feet get suddenly tight and you can't move them. Then your bike will come to halt, tip over, and you'll bash your head on the curb and be stuck there. (me)
Don't play karate with the kid next door or you might get your front teeth kicked out. (my sister)
Don't confuse flour with yeast when you're making gravy or else every time you stir, it will just continue to grow. (my Dad)
Don't go down a metal slide in a bathingsuit or else you'll burn your ass. (me)
Remember to turn the oven on when you cook a turkey or else 8 hours later it will still be cold. (me)
Open the damper before you light a fire or else you'll smoke yourself out of your house. (me)