In what world do Knight Rider and Cheers co-exist? Recently, David Hasselhoff and Cheers star John Ratzenberger made a cameo in a new AT&T commercial.

Last year, we reported Knight Rider was being revived by digital network Machinima and director Justin Lin. The action drama ran on NBC for four seasons before ending in 1986.

In the new AT&T commercial, titled “Everywhere,” you can also catch cameos from Sesame Street‘s Big Bird, the puffy shirt from Seinfeld, and what looks to be Walter White and Jesse Pinkman from Breaking Bad.

Watch the new ad below:

https://www.youtube.com/watch?v=fmD6ntwtz0s
What do you think? Do you use AT&T? Are you a fan of Knight Rider and/or Cheers?