At any rate, when I was a kid, we would occasionally watch movies via a projector and on those rare occasions when we would get to see something happening in reverse (dandelion fluff returning to the plant, things of that nature), we were astounded.
So, when I discovered that there was a YouTube channel called Let's Melt This (seriously) and that they had a video of "unmelting" things, I had to watch. Here it is:
And if that wasn't enough, here's a compilation video of things being melted.
Click through to the YouTube channel for more videos (there are a lot of them).