Dumb and Dumber - The Buttcrack Song
"2 Ft. O' Buttcrack" is a song featured in the soundtrack for the film Dumb and Dumber. The song is heard briefly during the diner scene in the first half of the movie. Only the lyrics "2 foot of butt crack was all I could see," are audible before the sound fades out. The end credits of the movie list the song as being performed by a band called "Circle the Wagon."
According to the Wikipedia article on Dumb and Dumber, the only known copy is somewhere in the possession of New Line Cinema.
Bruce Greenwood's involvement
In an interview with The Hour, Canadian actor Bruce Greenwood claims to actually be the man singing in the song, and that "Circle the Wagon" was misattributed during the production.