The favorite one of mine, and one that actually worked was:

If I followed you home, would you keep me?

C'mon you lot, what worked for you

Here is £10. Drink until I am really good looking, then come and chat to me.

That's seriously scarey man!!

I find the honest and direct approach the best "Hi it's 10:45, the pub closes in 15 mins, and I have to work tomorrow. If you want to fcuk, then I'm leaving now"