Some people open their wine bottles by pushing the cork inside. It's after all, the easiest way to open a bottle without a corkscrew.
You might, however, want to recycle the bottle later for some purpose, and then the question arises: what do you do with the cork stuck inside? It seems like the only way to remove it is by breaking the bottle, which is kind of contrary to the purpose.
Thankfully, this YouTube user knows an easy way to get that stray cork out of the bottle using nothing more than a simple plastic bag. While it might not be the most necessary trick around, it's definitely cool to watch (which your tipsy company of friends is going to appreciate when you demonstrate it at the party.) So, behold the power of the plastic bag!