A navy guy went to a bar, where he saw some guys sitting. He sat down, ordered a whisky and started chatting with one of them.
He said to one guy, "Wanna hear a joke on Marine guys?"
The guy replied, "Well, before you tell that joke, you should know something. I'm 6'1 tall, 200 lbs, and I'm Marine. The guy sitting next to me is 6'3" tall, weighs 220, and he's a Marine. The fellow next to him is 6'10" tall, weighs 270, and he's also a Marine. Now, you still wanna tell that joke?"
The navy guy said, "Nah, I don't want to have to explain it three times."