Ahhh thanks!

"In the Family Guy episode "I Take Thee Quagmire", Adam West coerces Alex Trebek into saying his own name backwards, sending him back to the fifth dimension."

I remember him old SuperFriends series!!

That's just what your mother said, Trebek !

Bootlegged from a video the X-Files crew made for Duchovny after hearing Bree Sharp's song. I know the quality's not great, but this is the first copy I've seen where the audio syncs up, so it could be worse.

You'll recognize the X-Files actors & Chris Carter, the creator - but here are the celebrity cameos, in order:
Janeane Garofalo, Charles Nelson Reilly, two "Baywatch" babes, Garofalo again, Jerry O'Connell, Alex Trebek, the women of "Frasier", Erik Estrada, Hector Elizondo, Kevin Nealon, Calista Flockhart, Rosie O'Donnell & Whoopi Goldberg, Melissa Etheridge, Jenna Elfman, Gary Shandling, Dennis Franz, Brad Pitt, David Spade, Sarah Michelle Gellar, George Clooney (in a wig), Pam Anderson, KISS, three porn stars (because Duchovny admitted in an interview he likes porn), and Jerry Springer.