Two men were stranded on a tropical island... They got to a bridge with a guard next to it. ""I won't let you walk over my bridge unless you bring me three things that satisfy me."" The two men search the island, and the first man returns with three blueberries. The guard says; ""Shove them up your butt."" The man proceeds to do what the guard asked for, and then starts laughing hysterically. The guard asks; ""What's so funny about shoving blueberries up your butt?"" The man, who is laying on the ground with tears of laughter, points at his friend carrying three watermelons.