The movie is probably only gonna be remembered for the diner scene where Jack tries to order something not on the menu.
This site suggests that the title refers to a typical practice book title for a beginning student.
Dupea: I’d like a plain omelette, no potatoes, tomatoes instead, a cup of coffee and wheat toast.
Waitress (points to the menu): No substitutions.
Dupea: What do you mean? You don’t have any tomatoes?
Waitress: Only what’s on the menu. You can have a No. 2–a plain omelette. It comes with cottage fries and rolls.
Dupea: Yeah, I know what it comes with. But it’s not what I want
Waitress: Well, I’ll come back when you make up your mind.
Dupea: Wait a minute. I have made up my mind. I’d like a plain omelette, no potatoes on the plate, a cup of coffee and a side order of wheat toast
Waitress: I’m sorry, we don’t have any side orders of toast…an English muffin or a coffee roll.
Dupea: 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?
Dupea: You’ve got bread and a toaster of some kind?
Waitress: I don’t make the rules.
Dupea: 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 No. 2, chicken sal san, hold the butter, the lettuce and the mayonnaise. And a cup of coffee. Anything else?
Dupea: 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 (spitefully): You want me to hold the chicken, huh?
Dupea: I want you to hold it between your knees.
From the screenplay by Bob Rafelson and Carole Eastman
(Just picture Jack, the homicidal maniac, saying this. And then he clears the table with a swoosh of his hand and arm?