Hmmm, stick vasoline all over the seat. Edit - Searched google for some methods and a bunch of stuff about potty training cats came up, wtf?
I was going to say the last option as well Only problem is that he might not want to clean it up, since you put the plastic 'round it..
Yeah, I was going to say the plastic wrap option, but if he comes and goes, he would likely leave the mess. Better to take the light bulb out and replace it with a burnt out one if you have it, and spread some toothpaste or vaseline on the seat. Also, as with any warfare, get ready for the rebuttal.....
put one of them glass encased stink bombs under the seat...balance so as not to break. he/she will sit and break it.....but they will already be committed to shiting and retreat is not a real option...they get to sit there and absorb scientifically designed max stink for...well only a few minutes, but how much is humor worth to you?
or coat the toiletpaper with stuff that makes you itch.. or.. with a pepper substance for a nice burn Ouch.. I didn't just suggest that.. I'm a lovely peacefull hippie.. damnit!
I've been to New York and the toilets there were just totally crappy - I was scared using too much paper in fear of a disaster, flushing it down separately several times. My advise to people with this kind of problem: Why not move to Sweden or something - we haven't got that kind of problems here 'cuz our toilets got wider water pipes and flush more heavily. Alternative solution: Hire a tough guy to bounce the troublemaker out of your turf! Good Luck!
Haha yeah, in my old house we had the good old fashioned uses a ton of water super toilets, never got stopped up or anything.... Where I live now has the new crappy water saving shit toilets that barely work...
Leave an upper-deck for him..... although you will have to suffer through. Maybe you can use another bathroom until the upper-deck is exhausted. He'll love that.
I know the feeling. The place I live now has the worst toilets I've ever had -- they get clogged at LEAST twice a week... We just keep the plunger next to the toilet, instead of hiding it away in a closet like we'd like to...