"I know a guy"

I love how guys always seem to "know a guy" that can do something or get something for them. Absolutely nothing is wrong with it. It's good to be so connected and have so many friends. I just find it amusing. I can't even say why. Maybe I just wonder if this person who is so dependent on his guys is ever "a guy" that someone else knows. I'm sure he is, he just never talks about it.