My project experiment involved some change changing into other change!  I used U.S. coins to collide into each other to change into the coin they equaled.  The first half collides five pennies into a nickel, and the second half uses two quarters into a half dollar.  Please see my YouTube description for more info.  It certainly is harder than Tortor makes it look (to get the timing, shadows, sound effects, etc. right). 

 Update:  I was originally unable to post a link in the proper way from an Android device and mobile browser, so I just added it in text here.  I have, however, been able to successfully add the link from a PC now, so clicking on the video should work.  But in case it fails at some point or other people have issues on other platforms, here's the YouTube link:   https://youtu.be/JwKEhQW8QGw