When you make cookies as often as I do, it is in everybody's best interest that you share said cookies instead of keeping them all to yourself. John usually brings a big stash to work, but when there are chocolate chip cookies to be eaten, John can be a little less generous.
I made crispy chocolate chip cookies on Halloween, and despite putting them in airtight containers, they managed to get stale in a matter of days. Throwing away homemade cookies isn't usually high on my to-do list, so I figured out a way to salvage them.
Next time you have stale cookies, all you have to do is heat them in the microwave for 15 seconds or so. The staleness disappears and the chips become fresh-out-of-the-oven melty. Just what I needed, a way to finish that last dozen cookies!