Funny Pizza Land comes to mind. I'm unsure if I could write a description that would do it justice.
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Worlds.com too, but I'd barely call it a game. It's like Second Life years before Second Life became a thing; an online experience that's like a bunch of interconnected 3D chatrooms. It's still up and running, and the current userbase is mostly a small community of people who have fun creeping out curious new users. Their behaviour has started rumors of the platform being a hangout for freemasons, cult members, the illuminati, etc. but it's all just for fun(?). If you enjoy exploring weird forgotten recesses of the net it's worth a look.