SW: The Force Unleashed for the Wii;
was fighting my friend, we had the wiimote lightsaber attachments on.
I whacked my friend by accident with the "light saber" (that's how into it we got XP).
Friend flinches and, consequently, force-pushes me into the sarlacc pit. :(
Dunno about anyone else, but I had a hard time with the Boost Ball Guardian from Metroid Prime 2: Echoes.
The turd took out half an energy tank with a claw swipe, and when he went into boost ball or goo form, getting so much as tapped by him almost took out a full energy tank.
Not to mention...