Classic pickup line that needs to be spoken on film: "What's your gender?"
Also, the classic fat girl scene: powders her nose with a jelly donut, then pokes a hole and smears jelly on her lips like it's lipstick. Finally, eats what's left and leaves the bathroom to join the party.

Idea for movie opening: We see a young guy get up from bed and go through his daily routine, the catch is we hear the commercials theme songs of each product he uses before he gets in his car (which also has a catchy song from a commercial like Born To Be Alive).