So, Johnny and his girl Sally are going to prom this Saturday. But, before they can go, Johnny needs to make sure they have a perfect night.
So, Friday comes, and Johnny goes out to get his tuxedo. When he gets to the tux rental store, there's this ridiculously long line. But he needs the tux, so Johnny waits. And he waits, and waits until finally, he has his tux.
Next, he needs a limo. So he goes to the limousine rental shop and finds that there's an even longer line there. But he needs the limo, so he waits. And he waits, and waits, and waits, until finally, he has the limo ordered.
Johnny realizes he needs some new kicks, so he stops by a shoe store to get himself some nice shoes. When he goes to pay, he sees the longest line yet. But he needs the shoes, so he waits. And he waits, and waits, and waits, and waits, and waits, until finally, he's got his new shoes.
Saturday, Johnny's ready to pick up his girl. He drives over to her house, picks her up, and they head to prom. At the dance, they're having a great time, dancing, playing at the casino, hanging out with friends. Soon, though, Sally gets thirsty, and asks Johnny for a drink. Being the good guy he is, Johnny obliges.
So Johnny walks over to the punch table, and what do you know... there's no punch line.