Recover your data by putting your Hard drive in the freezer: Myth or reality?

A few weeks ago, I had one of my personal Hard Drive fail on me. I was able to recover the data on it by using PC inspector for windows. While doing some research for a solution to my problem, I ended up on a few stories about people who were putting their HD in the freezer to help fix it long enough to be able to get the data off the disk. I guess that by doing this, some metal parts in the HD could contract, putting back in place defective parts, and making everything work again for a few minutes.

What do you guys think? Myth or reality?