"A blind man walked into a bar one night. One of the patrons at the bar saw him and helped him get to a barstool and get a drink. After a few minutes, the blind man leaned over to his new friend and said, "I just heard the world's best blonde joke. Would you like to hear it?" 
The other man said, "Friend, before you say another word, there's something you need to know." 
"What's that?" the blind man asked. 
"There are five people besides you in this bar. The bartender is blonde. The bouncer is blonde. There are two women sitting at the end of the bar. One is an off-duty police officer, and the other is a Marine Corps gunnery sergeant, and they're both blond. I'm six-foot-four, two hundred and sixty pounds, and I've got a third degree black belt in karate, and I'm blonde. 
"So," the man concluded, "Are you sure you really want to tell that joke?" 
The blind man thought about it for a minute and said, "No, not if I'm going to have to explain it five times."