A young man asks a young woman to go to a school dance. She agrees, and he decides to rent a suit. The rental has a long line, so he waits and waits, and finally he gets his suit.
He then decides to buy her some flowers, so he goes to the flower shop. The flower shop has a long line, so he waits and waits, until he finally buys flowers.
The night arrives, and the young man picks up the girl and they go to the dance. There is a long line into the dance, so they wait and wait, and finally they go in to the dance.
The couple dance for a while and get thirsty. So the young man offers to get the girl a drink. She asks for punch, so he goes to the drink table, and there is no punch line.