I hate to scare anyone, but I've found the Slinky to be a very effective garrote.

I've seen Tommy Smothers do a lot of damage with his Yo-Yo.

Etch-A-Sketch can be filled with explosive gunpowder (it's even the correct color).

And I can fill my Magic 8 Ball with combustable liquid and stick a fuse in it and it'll be just like those round black bombs you see Boris tossing about in those Rocky and Bullwinkle cartoons!

Yeech.