The February 2012 issue of 7×7 Magazine includes an ad for DIFFA which prominently features those disgusting “butt chairs” that seem awfully reminiscent of toilets. You may have encountered these chairs if you’ve been to Osha Thai on Valencia recently, as reported by MissionMission.
Alas, the question of who actually wants to be reminded of butts while eating is still unanswered.
Update: Laughing Squid has the dirt on the toilet-y butt chairs.