What instruments do the most bloodthirsty people play?

Harm-onica and violint.

What's the difference between Muslims and vampires?

Eventually the vampire stops being bloodthirsty XD

What's the difference between a Jihadi and a vampire.

The vampire will eventually stop being bloodthirsty.

Cops in the U.S. are like vampires

They suck, their bloodthirsty, and can't come in your home unless invited!