http://www.youtube.com/watch?v=c1zktTCVrDs#t=108s
I usually understand most of Weird Al's references, but this one baffles me.
What's wrong with eating pastrami on white bread with mayonnaise?
(For background, I am Christian and I've read the Old Testament. I understand the idea that certain foods are kosher and certain ones aren't, but that's where my knowledge of Judaism ends. Please assume that I have little to no background knowledge.)