The Dallas Mavericks wished their fans Happy Holidays with their latest video which features members of the team singing the classic "Sleigh Ride". At least, they attempted to sing it. Dirk Nowitzki, Dominique Jones, Dahntay Jones, Elton Brand and O.J. Mayo all took part, as well as head coach Rick Carlisle. Watching the players attempt to sing the "giddy-up" lyric is worth a few laughs. The song's fast pace was too much for Kaman, who was no longer in a festive mood when he was done filming his segment. Video via DallasMavericks. Visit us at holdoutsports.com and follow us on Twitter @HoldoutSports.