Sometime in the recent past, I promised to post this gem, but I can't find that particular thread at the moment. I learned this at a post National Storytelling Festival party a couple of years ago ('98, I think). The instigator was Ed Stivender, a 'teller from Philadelphia who probably wrote it, as he has *that* kind of humor. He probably wrote it, and I hope he doesn't mind that I'm passing it on without permission. Anyway,
(to the tune of, surprise, Pachelbel's Canon)
And the four parts are:

Enchilada, enchilada, etc

Margarita, margarita, etc

Cheese Burrito, cheese burrito, etc

(descant) Ya, ya, ya, etc.