the only way youre going to "win" is if they know its you that does ____ to them.
anything that embarrasses/upsets them is going to make them lash out at their normal targets for ego boosting moreso than they already do. If they are not aware that you're behind their embarrassment, it's going to make them that much more agressive torwards you and thus is a bad idea.
best way to handle school bullies is to pick the weakest one and beat his ass where everyone can see it. In todays world thats a trip to the police station and possibly a fine, but sometimes things have to be handled like that.