I know what you're thinking -- there's no way a product can top the swinging testicles in the "stupid truck accessories" department. Well making a valiant effort is the Hitch Hand. It's a $40 hand that mounts on your truck hitch. You can form it to make such hilarious gestures as "the finger" and "the shocker". Oh my god if I had been old enough to drive in 8th grade this thing would have been the shit.
Thanks to Kelly, who knows a classy product when she sees one, for the tip