Thanks to Bold Lentil for this submission:

« You’ll never look at a screw the same way again. Starting with an
anecdote from a bar in Brazil, this post has a simple DIY to make
your own bottle opener. From there it’s simple to consider how
to fill your world with built in bottle openers and a decent example
of extreme re-use. »

Simple and elegant. There’s no excuse to go thirsty!

World’s simplest bottle opener [link]