That feeling when you are in Multiplayer, have 42000 score, then the only capable member besides you leaves, thus you are alone with two noobs and lose at the end of 10th wave.
Or last night.... finally cleared round 6 tasks (some other members screwing around instead of helping), and have used consumables to survive getting the rest down - when the
game host leaves, restarting the round so we have to do it again.

(edit: other wacky thing I ran into in MP yesterday.... had a few MP matches with three people in the ~120 rank range and one guy with ~350

And he must have played a huge number of games, since he had the lowest score among the four of us at the end of each round.)