These guys are in a cafe and they have dogs that
    they leave outside tied to a tree. One guy runs in
    asking," Who's the owner of the doberman?"
"I am," says another.
 "I'm so sorry," says
    the first guy, "but my chihuahua just killed your dog."
"What? How can a tiny dog like yours kill a 150 lb dog like
    mine?" asks the doberman's owner. 
"My dog got stuck down your dog's throat and cut off his air
    supply," says the chihuahua owner.