This trick will hold you in good stead for many
years of beer drinking. The cheap, flat-sided
lighters work best, but any of the common disposable
types, or for that matter any similarly sized and
shaped hard object will work.
Step 1: Firmly grasp the top of the neck, such that
the web of your thumb is flush with the bottom of the cap.
Step 2: Insert your lighter between your first
finger and the bottom of the cap. The proper position
is centered between the base of your finger and your
first knuckle, with the lighter perpendicular to
your finger-bone, and straight out from the bottle. You
should be able to hold the lighter in place with the
pressure between your finger and the sharp edge on the cap.
Step 3: Now, this is the important part. While
grasping the bottle's neck firmly, use your other hand
to leverage the lighter down (kind of like trying to
wrap the lighter's free end around your finger), using
your finger as the fulcrum. The leverage should
enable you to quickly and smoothly pop off the cap
without causing any pain. If your finger is hurting
you when you apply pressure, try readjusting your grip
on the bottle.
This can be slightly difficult the first couple of
times you try it, but just a little practice, and
you'll never have to ask, "Does anyone have a bottle-opener?" again.