@skaterboybam "Elvis" was drummer Clem Burke. Really doubt they brought him back 10+ years later (after he played like only 2 gigs with them...) to play bass on Letterman.
I met Paul Shaffer once and talked with him about this. He said Letterman was really upset and thought it was for real. Awesome stuff, Late Night was the greatest show ever back in those days.
Hahahahahhaa. Oh my god. This is too much. The kids are horrible performers on top of everything else.