Why do people do this?

Ok I work at a Chinese restaurant. It so dang busy sometimes, I wish I could take a breather sometimes. Anyhow, a couple of moron's called and you could tell that they had nothing to do but harrass others. So they called and I was like, "What would you like to order? They said, "I would like to order some wonton soup? and what sizes do you have?" I said, "Large or small?" They said, "Do you have a medium?" I said,"Sorry, we don't. Only large or small." Then he was like, "I would like to take a medium." I said, "We don't have one." And it was on like donkey kong.
After a few minutes, I was like, "If you guys aren't going to order and this is a business, don't call back!" So I hung up. Right after they called back and did it again to the other girls that picked up the phone and finally I got back on and said, "Sorry, we are closing." And we were closing in like 5 minutes. I was like geez louise. what the F&$K? So I come back the next day. OMG! ARE YOU FLIPPING KIDDING ME! The same guys calling back and ordering something different and messing around. Well of course, I was not in the mood for this s*&t! So they wanted a small entree with a soup. Guess what kind? So I said, "Yes, we have a medium." then they said, "Oh, can I order an extra large?" OMG! I said, "If your not going to order, then don't call back or I will be having the police deal with you! and we do have your phone number here on caller id. (which we didn't, it showed up as being private) but it worked. They didn't call back. so I am glad. Dang IDIOTS! Why do we have these types of losers living among us?