i had two weird ones. well, one annoying one and one weird one.
on The Dark Knight, i was starting ball 3, and I had Joker Multiball ready to start. unfortunately, i failed to notice that it loaded two balls into the shooter lane. so i gave it a normal plunge, but the two balls did not have enough momentum to make it into the pops like normal, and instead both came down the right orbit and went STDM. game over.
the weird one was an airball on High Roller Casino. It landed on the wireform, and rolled down that to where i already had a ball locked. the game appeared to deal with that okay, because it correctly spit out one of the two balls and allowed my turn to continue, but i think it somehow lost count of the balls in play at that point, because on the next player's turn, they successfully hit the wireform ramp, and the game immediately ended their ball for no reason.