Selvec said:
I would love to see a bad ending that is canon.
I'm pretty sure the worst ending for Silent Hill 2 counts as the canon one.
I thought we were talking about bad endings as in stupid, unsatisfying or ridiculous endings, though. For that, I'd go with the utter failure of a horror game "D". It also happens to be the "evil" ending! Your father, a vampire, kills and eats you and then presumably takes over the world or whatever he was trying to do.
Here it is! I think the graphics hold up really well:
Another possibility would be the PC classic "Harvester". Another game which has aged superbly, but I'll let it speak for itself:
As far as the other kind of "bad" endings go...pretty hard to beat Silent Hill 2's. It's poignant and horrific, and is probably the most fitting ending for the game (which is why it's the canon ending.)