What's the worst employee you've had/seen?

my parents owned an outdoor retail store when I was a kid and they hired this local girl. Well after a week they opened the employee closet and a pair of 100 dollar sun gles fell out of the girls purse. They warned her once and it happened again, they found jackets thrown over the back wall. They fired her and were threatened the next day by her "brothers" who told us we had just started a whole mess of trouble. :)