1. bottle opener(usual way)
2.car rims
3.teeth
4. machete
5. bottle opener(way using the part where u hold it as usual)
6. the gun
7. PAPER(coolest and hardest way)
8. table
9. another bottle
10. mobile phone
11. machete
12. sword
13. mountain bike
do you know any more ways?
Yes!
14. Lighter
15. Ring (á lá WSM 2005)
16. Sabre
17. Shaking the beer really hard until the cap comes off
18. Syringe
19. Acid
20. Hammer (keeping a box below and then a filter for the glass)
21. Wall (see above)
22. Shaking the bottle and then making a hole in the cap with a Victorinox, try drinking the flying beer! It's really great when you're drinking with hot chicks and they are wearing white shirts or blouses!
I forgot a classic one I've used many times:
23. Roadsigns (particularly the Danish ones that say "Ensrettet" ("One Way Street"))
There used to be a beer opening contest in a famous Hungarian show few months ago (like Jay Leno, just worse). Most of the listed things were there. And bike, too. ;D
Funny ad about this question:
http://youtube.com/watch?v=HP4-UvjKdYU
My (our) usual tools to open a beer: beer opener, knife, table tennis desk, concrete flower bed, 100 HUF coin+a TESCO shopping cart, turning the cap off (works only for suitable beers).
Also saw: teeth, small desk near seats on train (performed by a cca. 75 years old woman ;D).