"Der Schuh des Manitu" is something like a parody of the German Karl May movies from the sixties. Karl May was a well-known German novelist, those movies were based on his books. If you don't know the movies, you might be asking youself what "Der Schuh des Manitu" is all about.
And you shouldn't be expecting any sophisticated kind of humour. To quote a friend, "you'll have a blast watching it when you're drunk."