I get a kick out of the Jackass movies. Very few movies make me laugh so hard while at the same time looking away and gagging. It's the same kind of fun I had watching Observe & Report or Borat.
I love the stunts and pranks, but I don't like the bodily fluids so much. Anything involving shit, sweat, or semen is just sick and wrong. Although the pee cam was pretty funny.
My favorite sequence was the bit with the midget fight in the bar. Priceless.