In PHX today:

SWA: "Ground, SWA XXXX, ready to taxi to the conga line!"
Gd: "SWA XXXX, taxi to the end of the line via Echo, chicka chicka."
SWA (chuckling): Reads back clearance
(Pause)
Gd: "Did you get the 'chicka chicka'?"
SWA (laughing): "No, I guess we didn't"
Someone else: "Bom bom bom bom bom bom (conga beat)"