Industrial toilets seem to be ok, unless you're hung like Chuck Norris, but when you go to your grandma's house and she has that tiny little crapper with the fuzzy blue rug and seat cushion; you are guaranteed to pestle and mortar that rig.
A marriage of the pittsburgh steamshovel and a skullfuck. Taking a shit in the empty eyesocket of a one-eyed hooker, then squishing your cock into it. Extra points awarded for the famed "Eye to Mouth" move afterwards.
Stump: I got rolled by a one-eyed hooker last night
Nick: How?
Stump: I just finished giving her the Missoula Mortar and Pestle, then she slapped me with a crowbar and took my wallet