Great thread. For paper targets, I like the splatter ones, particularly the ones where each ring is a different color.
I've shot gallon jugs filled with water and that was fun, too. With my brother-in-law, he strung them between two trees and we each tried to shoot a little lower than the next. It was fun. I've also shot gallon jugs set at 25 yards, 50 yards and 100 yards. Sometimes, after they were empty, they'd go flying waaay up in the air.
I once brought a watermelon to an outdoor shoot. I always wanted to shoot one. That was fun. I shot it all up but then someone shot it with some higher caliber rifle and sent it into a hundred pieces. That was awesome.
i really like metal targets at the outdoor range JonM goes to. I could spend a couple hours on the .22 range alone. Every rare once in a while I make it up his way and we spend an afternoon shooting. The range he goes to is very fun. And Jon is a great shooting buddy. He's patient, teaches me a lot and brings some really crazy fun firearms to shoot.
I wish I had access to some open land to shoot on. I'd like to try some of those reactive ground targets I've seen at the stores. I'd also like to shoot some cheap pop cans still filled with pop. I'd like to try shooting some tannerite, too.