Have you ever used that software? Actually it's a site, called Xtra-Normal. It's dead easy to use, just a little time consuming.
A few months back I made a vid on it. It's a bout 4 mins long but took a couple of hours. Was work related so would make no sense here, but was hilarious in the office.
Someone should make and MR2 one. It's pretty cool, you can pick backgrounds, voice, accent, look and style of the characters and then just type in the script. You can animate the characters a little, ie, wave hands, shake head, smile, jump and so on.
Check it out:
Xtra Normal