Quite a few things, but mainly;
Getting American girls naked.
I had this down to a science when I was a teenager. The experiments were so successful, that much like gravity, the effects can be accurately predicted on 100% of occasions.
Here are the steps:
1. Be English.
2. Meet American girl, ideally in a college environment
3. When they say "I love the British accent. Say something!" (and they will), simply respond with anything. Exaggerate your accent and slip in stereotypical British words and phrases if you think it's hilarious that they'll believe you. At this point victory is guaranteed lol.
Seriously guys it's so easy. One time when I was 16, I found myself in a hot tub with 5 hot college girls within half an hour of meeting them.
Being English in the US = epic win