As soon as you understand 2 x 4 you can't believe there was a time when you didn't understand it.
It's easier to knock on a door that's not shut all the way.
Before you trade sandwiches, check between the bread.
Hitting the kid with the ball might get you the ball, but it won't get you anyone to throw it to.
Sometimes it's smart to be scared.
Ten minutes is short if it's a recess and long if it's a punishment.