This is easy...the best and funniest song title by far is Anal Cunt's I Ate Your Horse. First time I heard it (and the song) I couldn't stop laughing for several minutes...there's just something in the blunt statement: "I ate your horse" that kills me. Also, why horse? Why not wife, child or something like that which one could expect from AC...but your horse? Cracks me up everytime!