One thing you can't pretend to be is funny.
They'll remember you if you're the best reader in class-or if you throw up at lunch.
You can teach an old dog new tricks with the right kind of doggie treats.
Hitting the kid with the ball might get you the ball, but it won't get you anyone to throw it to.
Crawling still gets you there.
Don't say "The last one there is a rotten egg": unless you're absolutely sure there's a slow kid behind you.