Games that are either terrible to play, make absolute no sense, and appear to have been for no other purpose than doing it for laughs or to prove a point.
For the longest time, Plumbers Don't Wear Ties has stumped me. I tried to look at it from every point of view, looking into why it was made, how it got funded, why it was released at all, but nothing was making sense. I have finally come to the simple conclusion that this game is nothing more than a shitpost. It does not make sense and it doesn't try to. It's only purpose is to confuse you and make you ask "what the fuck did I just play?" The only other explanation was how its release on the 3DO was a way to expose T3C for their loose licensing policy.
So what other games exist for the sole purpose of making no sense? Not games where people actually tried to produce something quality and failed miserably, this is for games that turned out fantastically terrible on purpose.