Tandems. Every chance I get.

I jumped on the wheel of a couple of kids on a moped once - that was fun and they got a kick out of it.

The dumbest thing I think I ever drafted was a motor home, along with a group of about 8 other riders. The motor home was a support vehicle of ours that we were using on a supported multi-day ride, and the driver kept it at a perfectly even pace, and the road was straight and flat, but it was still a really dumb thing to do, as there was absolutely no view at all of anything ahead of us, like potholes or speedbumps, or cops or . . . . It worked out fine, as none of the possible disasters befell us, and it sure was fun. It also got us through a deadly dull stretch of countryside a lot quicker that we otherwise could have gone.