This was my first cartoon I ever did and it was in microsoft paint.
It's not really noticed but I think this might the best thing animated in paint ever!
http://www.youtube.com/watch?v=1pLyK7_O4LA
And for real this thing isn't slow and dumb like most other paint cartoons..
I don't really know if it beats Lubin red vs blue though.
http://youtube.com/watch?v=1x4BYP2Ux28