Some of my favorite are in the "wanted" section. I always see terrible options, like
"I need a computer that can play recent games, and it has to be fast, and have at least 4gigs of ram, and needs to have at least 500gigs of memory, and I only have $100."
I saw another one many years ago about a guy who wanted to have obnoxiously loud sex to irritate his upstairs tenant who he could hear walking around all night and who apparently "peed really loud".
Or, "need a good running car, I will trade you an Xbox360 and like 4 games from 5 years ago"