Not a song, but while we're drifting in the waters of vaguely related things, this reminds me about the long prom joke:

There's a young boy, who's getting ready to take his date to prom. He gets in his car and hits a busy stop sign, where he waits for the line cars to pass, until he can turn and pull into her driveway. His prospective date was quite the looker, so there was a long line of potential suiters waiting at her door. Nervously, the boy waits his turn until finally, he asks, and she accepts his request! She will go to prom with him. Now that he had a date, he had to get a suit to wear; he drives to the department store to get one. Being the day before prom, the store is busy with young men and women shopping for last minute gifts; there is a line of cars waiting to turn into the store. The boy finally parks and makes it to the nicest tailor in the place; naturally, there is again a line.

You can set it up ad infinetum (once while camping I engineered a version going on probably 20-30 minutes, complete with stops at the drive-through [the kids got hungry], a fancy restaurant, a cake shop, ties, corsages, his dates' lipstick, and even antecedent info, such as recalling his wait in line to buy supplies to make a "promposal" sign, etc) until they finally make it into the prom (the place was busy, so there is again a line to enter the door). His date says she is hungry, so he waits through the buffet line to get her some horderves. He comes back with the plate, at which time she informs him she is also thirsty. He walks over to the drink station and -- what shock! -- there is no punch line. And, cue the groans. For best effect, constantly ham up how worth it the pay out is, and make sure to also introduce it as a long, but worthwhile, joke.