"The Bouncy"
From TheChels.info - The Chelsea Football Club Wiki
"The Bouncy" is a song borrowed from Glasgow Rangers, with the words adapted for Chelsea with the implication that anyone not joining in is a Tottenham fan. The song culminates in all fans bouncing. Sometimes preceded by a chant of "We're gonna bounce in a minute".
To the tune of "She'll Be Coming Round the Mountain".
If you don't do the bouncy you're a y*d,
If you don't do the bouncy you're a y*d,
If you don't do the bouncy, don't do the bouncy,
Don't do the bouncy you're a y*d.
Oooooooooooooohhhhhhhhh...
(while bouncing)
Bouncy, bouncy, bouncy, bouncy, la la la la la,
Bouncy, bouncy, bouncy, bouncy, la la la la la.