D
DO
DO A
DO A B
DO A BA
DO A BAR
DO A BARR
DO A BARRE
DO A BARREL
DO A BARREL R
DO A BARREL RO
DO A BARREL ROL
DO A BARREL ROLL
DO A BARREL ROLL!
http://www.youtube.com/watch?v=DaE3oG6IQRw
http://www.youtube.com/watch?v=zzPRo_2oCy4&feature=related
http://www.youtube.com/watch?v=F5QqY_1SAWc&feature=related