A blind man says to his silent son, "How do I know that you're not dumb? Can't see wheels turn in my condition. Give me five dollars in questions."
His son said, "One, dummy, who you talking to? Two, don't you know that I'm blind like you? Three, how long have you been sittiing with me? I'd say that's five dollars in questions."
The blind man held a five-dollar bill that he got for his son from the bottom of the till. The son pulled a gun, said, "That's just a one. Where's my five dollars in questions?"