Haha! I took the motorcycle endorsement test on the bike I have now (76 SS, it was my dad's at the time). I got one mark off for putting a foot down on the u-turn, and passed with a good score. Little did I know that a lot of bikes weigh less than 500 lbs! I still think these bikes are heavy as hell, top-heavy, especially.
On a related note, I took my driver's license test in a Chevy Caprice station wagon, one of the old, huge models. Our nickname for it was the "grey whale". Passed the parallel parking and everything.
I do think learning on older, heavier, underpowered machines helps one in driving newer, lighter, faster models. I also still ride an old steel Schwinn bicycle. That fuKKer weighs a ton, too. So if I ever got a new bike, I would tear it up, right? Sheesh, I'm showing my inner Luddite, now.