This has nothing to do with SUP except the dumb drawing that I did below.. but this is the coolest thing I've seen in ages.
It's called Crayon Physics and click here to see what it all about..
www.crayonphysics.com/After watching the demo vid (a few times).. and then playing the demo game (for way too long).. I might have to buy the whole thing cos it was so much fun.
DJ