Homemade enema with a two-litre bottle of water. This was something I wanted to do for a while, but don't have any of the proper equipment - tubes and stuff. I figured a two-litre bottle has a narrow enough neck that I might be able to get it into my ass with a bit of lubricant, then I just need to stand on my head so the water flows down. Um. Or lie on my back in the bath - that will work!
(Pictures are a little out of order so the best ones appear on the search page - look at the filenames for the right order!)