I needed to sharpen a pair of scissors, so I did a quick Google search to learn the technique. I was very surprised to find a number of sites suggesting that scissors can be sharpened by cutting a piece of aluminum foil. It doesn't make any sense to me, and I didn't bother to try it. But there were enough references that I'm curious whether anyone has ever actually tested the claim and formed a conclusion. I found an assortment of comments from people saying it works or doesn't work, but nothing convincing either way.
For example, This Old House makes the claim.
Fold a sheet of foil several times and cut through it with a pair of dull scissors to sharpen the blades.
Aluminum Foil to Sharpen Scissors is a YouTube video illustrating the technique.