Jumping Jaws

Odontomachus bauri (the trap-jaw ant) makes the fastest self-powered predatory strike in the animal kingdom snapping it's mandibles shut at around 35 to 64 metres per second, (2000 times faster than a blink). Using a pair of huge muscles in the head it cranks the jaws wide open, and holds them cocked with a latch called the clypeus. Releasing the latch unleashes the stored energy, similar to a bow and arrow when fired.

http://www.berkeley.edu/news/media/releases/2006/08/21_ant_video.shtml

This shows all 0.13 milliseconds of the strike (slowed down 1667 times for our benefit)

And when a predator threatens, the jaws serve a double purpose as an ejector-seat. When they strike a hard surface, the forces generated are strong enough to catapult the whole ant through the air. Resulting in the "escape jump," with upwards trajectory of about 8cm or the "bouncer defense jump" where it clears a greater horizontal distance of up to 40cm.

But just like the daddy-long-legs spider; O.bauri is no threat to humans. Despite it's ferocious looks, it's puny mouthparts can not penetrate human skin (any attempts to do so just bounce it right off).