So I've recently been trying to curate a list of single player games that are fun for a group of people, not just the player, to enjoy or whatever. Trying to get that concept across is kind of weird. But say, if you're sitting in a room and someone is playing like, baldur's gate or something. That may be fun for you to watch, I don't know, but to me that's a game that provides a pretty solitary style of enjoyment. But if you're sitting in a room watching someone play Scribblenauts or whatever, you can offer ideas as to what you think they should draw or write or "scribble" I guess.
I don't know, I suppose it really could be boiled down to, what's a single player game that you recall having a great old time watching someone else play. Because, we've all been there. And super mega bonus points for features that might actually benefit from having some other brains to fish ideas out of, like that Scribblenauts example, I guess. Please and thank you, fun-friends.