tip for "cry babies"

this is a technique that i've found to be effective in stopping the "cry babies"--kids who will cry at the drop of a hat whenever something happens to them.
i used to teach a boy who was very active, yet very clumsy. he was always falling or bumping into things. he'd get that sort of shocked look on his face, look at one of the teachers and start screaming.
well, one time, when he fell it was kind of funny looking. so again, he got the shocked look on his face, looked up at me....but instead of seeing my "worried" face, he saw me laughing. so he started laughing too. no tears at all.
so every time he hurt himself, i started laughing. and it worked!! as long as he wasn't *really* hurt, he'd just start laughing too.
and i've tried it with other kids too with much success.