Being for the benefit of Mr. Kite by the Beatles (from Sgt. Pepper's lonely hearts club band)
The story goes that Lennon spotted an old poster advertising a circus act featuring Mr. Kite and that every act/person/animal featured in the song was taken straight from this poster. Also, the zany sound effects in the middle of the song were supposedly created after the producer instructed the technicians to chop up the physical audio tape into pieces, throw them in the air, and randomly re-join them. As with all Beatles stories, one can't be too sure about the absolute veracity of this one. Very interesting, nonetheless.