In the first two Viewtiful Joe games, there was always one boss in each that would just halt me in my tracks, making me unable to complete the game. The most heartbreaking thing is that all of the guides for each boss had that particular boss listed as "The most pathetically easy boss in this entire game." In VJ2, that was the Frost Tiger. I can't remember who I was stuck on in the original, though, but that Frost Tiger needs to die.