He basically wanted a side of wheat toast but this did not come with the menu item he wanted.
Jack: "What do you mean you don't make side orders of toast? You make sandwiches, don't you?"
Waitress: "Would you like to talk to the manager?"
Jack: "You've got bread and a toaster of some kind?"
Waitress: "I don't make the rules."
Jack: "OK, I'll make it as easy for you as I can. I'd like an omelette, plain, and a chicken salad sandwich on wheat toast, no mayonnaise, no butter, no lettuce. And a cup of coffee."
Waitress: "A number two, chicken sal san, hold the butter, the lettuce and the mayonnaise. And a cup of coffee. Anything else?"
Jack: "Yeah. Now all you have to do is hold the chicken, bring me the toast, give me a check for the chicken salad sandwich, and you haven't broken any rules."
Waitress: "You want me to hold the chicken, huh?"
Jack: "I want you to hold it between your knees."
The whole exchange is found here: http://en.wikiquote.org/wiki/Five_Easy_Pieces.