I surprised myself with a wheelie on my DRZ. It wasn't really a wheelie, the front sort of just hovered a little above the ground, I realized that it was off the ground only after the touchdown and a slight jolt. It was pretty cool ! Don't think I managed it ever again though. It happened during one of my GP8 practices.
I see small power wheelies all the time in Gymkhana, a lot of riders grab a handful of throttle before a straight and it pops the wheel up a bit. Pretty cool. I've seen a number of stopies as well.