Hudson's Adventure Island
Hudson's Adventure Island is a strange game to me. It features a guy who lives on an island, which appears to actually be several near-identical islands, he wears a loincloth and a baseball cap, his name is 'Master Higgins', and his legs wobble and gyrate around like he's scrabbling to find footing on a slippery floor (which slidy-physics to match). He has to rescue a girl from an evil witch doctor, which is just enough plot to get the game moving.
And I'm awful at it.