ORIGINAL: Black Stick
Wouldn't the tar dry? Try running an electrical current through the thing. I'd put a camera up and laugh my @$$ off at the jerks. I was kidding about the electrical current (how would you get electricity to the stand?). Best of luck to you.
This is not a half bad idea. Just needs some refinement. How about a taser, that is hooks up to a stand? Might be some modifing of the trigger and such.