Who needs a corkscrew? Seriously, if MacGyver can light a fuse without a match or build a bomb out of a fire extinguisher, there has to be some kind of creative alternative to the corkscrew.
With a shoe
This concept seems to be fairly widespread among the corkscrew-less wine drinking community. A few key things to consider however: One, you have to remove the foil from the top of the bottle first. Two, pick a shoe with a thick sole, and determine the best way to maintain a solid grip on the bottle and the shoe simoultaneously. Three, try and stop before the cork comes completely out so you don’t spill any wine.
With a tree
This basically applies the same principles as the shoe methodology. Hey, if you’re out camping or at a picnic, this trick could come in very handy.
With a pen and an apron
A lot of sources will recommend simply pushing the cork down into the bottle—either with your thumb, the end of a wooden spoon, or even a pen with a string attached. The technique works, but this method gets extra bonus points for coming up with a way to fish the cork out.