:fu: I own every Dashboard Confessional album there is. I like them.
A bandwagon is in fact a wagon that bands use. Back in the days before marching bands, parades apparently featured musical ensembles set up in wagons. Interestingly, it is entirely popular that use of bandwagons was a bit bandwagony - they became a hip trend, so everybody started using them.
Jumping onto the bandwagon bandwagon bandwagon would be unreal enough to make Jean Baudrillard scream in his sleep.