You gotta start doing some blow or something before hand. Maybe carry a knife with you and just wave it around at random times as well. Girls want you to be little crazy. Maybe slip her some ecstasy. I dunno something to make her really remember the experience.
I don't know if you guys have seen "The Increasingly Poor Decisions of Todd Margaret", but I have told a girl that I am originally from Leeds. Worked for a while til she caught on that everything I said was coming out of my ass. Made for a great night though.