Heh - in my misspent youth one of my friends dragged me to a restaurant, and asked the hostess for a seat near the window. Turns out that she wanted to sit there because the waitress serving that area was her boyfriend's other girlfriend.
The waitress walked up, took one look at her and said, "I'll get you another server." I thought that was so classy!
If these people were really that obnoxious and/or uncomfortable, the really professional thing to do would be to offer to get them a different server, not sulk while secretly fantasizing about spitting in their food.