projectile vomit

Possibly the coolest affliction known to man, projectile vomit occurs only after you've done a very very bad job of taking care of yourself. Stomach acids and other half digested foods have been known to fly 3 feet and further. This should really be considered as an olympic event.

On the ground, the vomit may distract or repel predators. One side-effect of the expulsion of the stomach's content is that the bird weighs less, making escape via flight easier.