Yeah, I figured that out when I was racing bobman37. I shot a blue shell, and he purposely ran into a banana.
Oh, and I found out how to get a really good drift a second ago. ALWAYS be drifting, except if you're going on a strait road and you boost side-to-side. For example: If you are going on a slight turn, just hold drift and don't keep trying to get as many boosts as you can. When you get out of the turn, keep drifting until you're right next to a wall/offroad/edge. I don't know why it works, but it works good. I'm ancious to try it out on a fellow TMKer. ;)