A guy went into a nightclub and saw a gorgeous girl sitting by herself at the bar, so he went over and asked her for a dance.
She agreed and they took to the dance floor for a slow one.
While they were cheek to cheek, the guy said, "You really smell terrific, what perfume do you have on?"
The flattered girl told him it was Chanel No. 5, then wanting to return the compliment she said, "You smell good, too, what is it that you have on?" "Well," replied the guy, "I have a hard on, but I didn't think that you could smell it!"