The first time I recall seeing Garrett was during the late '80s, on the Hollywood Squares. One season, while he was one of the squares, they did a Halloween themed week and all the "stars" were in make up and costumes. Most of those type game shows would film up to 5 episodes in a day to run the entire week. Garrett dressed as Frankenstein/Herman Munster, so there was around 5 episodes of Garrett in that make up.
I remember him doing a pretty good Herman Munster impression more than once that week. And him saying something like, "I'm a cross between Herman Munster and Greg Brady! HAR HAR HAR!"