The ultimate to avoid in bowling, short of the actually beaning another bowler ball. The ball is supposed to roll down the aisle, and knock over all the pins but that's not what happens, though. It just floats, or glides, or walks, or what have you, and winds up over in the gutter, where it uselessly passes all the balls, knocking down NONE.
The Pain.
The Embarrassment.
The Cruel Mockery of Fate.
There is no score, you have one ball left to spare.
If you're lucky.