How to retrieve a Frisbee from library pond

1)Look at pond, decide not to get in myself

2)Go to store, buy a 6 pack of beer

3)Stand on library bridge with beer

4) Approach guys on library bridge, tempt them with beer

5)Bet guys beer that they cannot retrieve Frisbee

IF THEY AGREE

1. Have a beer while the Frisbee is retrieved
2. Take Frisbee from guy, hand over more beer, be glad you did not get in the pond

IF CHALLENGE NOT ACCEPTED

1. Drink all of the beers
2. Get in pond, swim out and retrieve Frisbee