Back when the phrase "See ya later, Alligator" just hit the Radio waves, two young males heard it and thought it was really cool. One was pretty sharp, and the other was kinda slow. The one told the other, here's what we're gonna do. I'll pull up in front of you house to let you out, and I'll yell "See ya later, Alligator" and you'll say "After while, Crocodile." The one thought this would really impress the girl next door that he had a crush on.
All the way to his friends house, they kept rehearsing the lines. He pulled up and went to let his friend out of the car, and asked if he knew his line, because he had kept messing it up. The guy said he did, so he got out of the car.
As he was getting out, the driver said "See ya later, Alligator." The youngster froze up and couldn't remember what to say. After stuttering around a bit, he said "After Supper, Mother Fu...ker."