Make your own warning sign with articulated ball-joint stick man
This ball jointed bendy man juxtaposed against a yellow triangular caution sign is certainly worth the $12 bucks, just to put him in some of the poses seen above. To the left, a perennial Haight Street favorite, the "Keep On Truckin'" caution sign. To the right, a stern warning concerning the dangers of marauding breakdancers.
Stickman Action Figure [Think Geek via OhGizmo!]

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Oh yes, the latter is extremely important, as proven by this video
Needs a red circle/slash component that you could mount in front of it all.
The one on the left is the international symbol for "Oh no you di'n't!"
this definitely could do w/some addons like black vinyl stickers for the sign for added emotion or airships no component.
i like.
You need an extra man to do that "Warning: Kung Fu" sign.