For all of you debating what constitutes a bad game and what doesn't, I'd like to remind you of our standards here.
While there's no such thing as "objectively bad art", I think we can agree that there are games that very nearly anyone would see and say "Who made this? What were they
thinking?" This is the sort of thing I seek.
So, Secret of the Magic Crystals is a good candidate- you might think it looks like an OK kids game, but you haven't seen the youtube videos. Bad Rats works, because it's simultaneously crass and mechanically broken. Daikatana is funny for how broken it is, in particular, if you know its historical context. Air Control is another great example: All of its ideas are both asinine as well as poorly executed. When you play, it continues to impress because every minute reveals a new, strange, broken idea. I wouldn't get Air Control because my friend watches Markiplier, he's probably got all the laughs out of watching it already.
Stanley Parable or Dear Esther, etc might not entertain all of you, but I think we can agree they don't give the same sense of "Oh my god, what were they possibly thinking?" I really truly do not think that Bad Rats has a single earnest fan.
The Your Testament -I've played it- is also a good example, I might still try putting that on a disc to make a gift out of it. It's intriguing, really, I can't think of a single demographic MDickie doesn't accidentally insult somehow while misquoting bible verses, preaching his own back-assward morals, and generally using Jesus himself as an author insertion figure- all in a broken engine he made for a wrestling game, while people run around suplexing eachother to death for no reason.
I also might do, you know, Forklift Simulator or something. But I think those sort of games don't have many laughs to offer while actually being played.
Anyway, there's some good suggestions in this thread, keep them coming! And no matter what side you're on, stop debating which games are bad and who hurt whose feelings or whatever. More obscenely, unquestionably bad games please!