I think Super Mario Brothers 2 had the least creative bosses of any game to date. It was always the same boss every time, just with different colors and slightly different attack patterns. It might spit out fire balls which might bounce with different patterns and/or speeds before it spits out an egg for you to chuck back in its face. If it would just come to its senses and not shoot eggs at you, the Mario Brothers would have been stopped in their tracks at game number 2.
Every man dies, but few truly live. Live your life to its fullest, every day as if it were your last.