Today, my fellow setters and I started discussing potential "circus attractions" for our comp this spring (Rain City Send at UW-Seattle, if you're curious). In previous years, we've done tabling (that's bouldering a table), a bat-hang and some Tarzan action. I know some folks have done the "mantle to sit on a chair," which seems like a crowd pleaser. How, specifically, does one mount a chair to a wall? Would it be harder if you have a textured fiberglass wall (e.g. Entrepris)?
Also, just to broaden the discussion, any other feats of human stupidity that people have incorporated or seen in comps?