The background story on the "We Will Rock You" CHEERS teaser

Dan O'Shannon, now an executive producer of MODERN FAMILY, was a producer on CHEERS when the "We Will Rock You" teaser was shot.  He dropped me a note with some more details. 

When we shot it, we weren't intending to fade out during the song. Instead, the song just kind of peters out, and that's when Cliff comes bursting in singing "we will rock you", too late to join in. When we looked at it in editing, it didn't seem all that funny, so someone (Cheri or Bill Steinkellner, I think) decided to cut out early.

Thanks, Dan!