Will Ferrell Totally Crashes David Letterman's Show As Harry Caray

05/06/2015 10:39 am ET | Updated May 06, 2015

Will Ferrell broke out his Harry Caray impression to crash "The Late Show" earlier this week, and it's clear he hasn't lost any mustard on his heater. In addition to coming onstage uninvited, he announced Cubs play-by-play, kept confusing David Letterman with Ed Sullivan and is apparently still stuck in the '80s.

Letterman's last show is set for Wednesday, May 20, so it's cool that Ferrell was able to fit in at least one more visit from Caray. Now if only someone could figure out what to do about that Berlin Wall.

"The Late Show with David Letterman" airs weeknights at 11:35 p.m. ET on CBS.

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