The worst clown would be the one with the supposed bucket of water. You'd run over to the bucket, turn it up to your mouth expecting refreshing lifegiving water and instead you'd get a mouth full of water absorbing confetti.

That or maybe John Wayne Gacy...

Cirque du Soliel clowns would be of no use whatsoever, contorting themselves all over the place

Lets face it, there are no good clowns in any type of situation.

Don't get me started on mimes and invisible 550 paracord...