I think the only episode that actually made me nauseated was the foot fetish one with food in shoes and whatnot, though the sheer amount of mayonnaise and ranch dressing in the food eps runs a close second.
The ones that really disturbed me, on the other hand, besides the plushophiles and the adult babies were the Juggalos (doughy white trash blegh) and, strangely enough, the bit where whoever was writing the post kept going on about his 'sexual area.' That's a serial killer right there.