SCM, won't hurt if your chin is made out of iron.
Chokeslam, one of the most painfull moves in wrestling according to wrestlers.
Powerbomb, just take a look at it.
Maybe the Zig-Zag, it's a back bump, but it's executed so fast the opponent has a risk of hurting the back of his head.
Also maybe, the Pedigree. I tried to sell some myself, and I ended up hurting my nuts way hard on the floor.
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F5, you'll never know where you're going to land, even when you're trying your best. Plus, it's a big height.
Swanton bomb, sometimes Hardy landed on-top of his opponent, which has a big impact on the ribs.
Spear, also just look at it.