1. Share the money around by buying friends beers in the pub till the money was spent
2. Invite the new friend for a beer in the pub
3. Go for a beer in the pub to try and remember where I parked my car
4. Go through the phone book to find a friend of the owner, pass on a message that I have his phone and he can collect it from the pub - where he should buy me a beer as a finders fee.

I see a trend appearing!