Cut him really bad when you're shaving him.
Worst Thing To Do On Your First Love

Slip him a viagra in his cola just before the two of you depart for the evening.
You are not a proper Lady, are you?

Tell her/him you play chess.
Girls have always found playing chess attractive.. You know the manly, intellectual type.. Bodes well for me anywho..
Pulling up to take her out in an all white commercial work van. Wearing your grandpa's clothes.. And creepy glasses... Oh and yes.. Definately a slicked down power part. I guess thats more of a first date worst thing to do.
Damn rigt! Look at that swagger. What girl can resist!
Order pizza with Moroccan anchovies.