Customers. You love them or hate them. Though you almost always hate them. I had a service call once where the guy asked me how to boil an egg. Wha.. I was dumbfounded. Who calls a Grocery store and asks how to boil an egg. Isn't that what the internet is for? 

Then there was this customer who knocked over a display and as I went to pick it up she had the gall to respond. "Oh. Looks like you have some work to do.." And walks away. Seriously! What jerk does that.