This bottle opener works better than any other bottle opener I know.
Step 1: Cut a Piece of Scrap Wood
the dimension doesn't matter
Step 2: Round the Edges
if you don't have a router, use sandaper
Step 3: Cut It in Length
Step 4: Drill a Hole
to avoid splintering
Step 5: Sanding
sanding, sanding ...
Step 6: Nailing
a nail with a big head works better
Step 7: Open Your Bottle
The secret is to push it down, instead of pulling