Most funny things happen at the Mara Kingdom Quest.
I really like looking at people being slaughtered when someone lure Mara/Marlone and lures them into the group. It's really funny to watch till you get killed yourself.
I don't mind failing. Really, if people played decently it's far enough to succeed. But one person could ruin it for the whole group, not even talking about leechers here. If you're in a party at Mara and you don't have a single cleric or one that could revive, then it's just bad luck.
But if people start doing stuff on their own ego and think they know better, then I'll enjoy watching everyone getting killed.