TIL in the How the Grinch Stole Christmas (2000), in the scene where the Grinch is directing his dog, Max, Jim Carrey improvised by mimicking Ron Howard's directing style. Howard found the impression hilarious and decided to include the moment in the final cut of the film.

https://en.wikipedia.org/wiki/How_the_Grinch_Stole_Christmas_(2000_film)#:~:text=During%20one%20s…
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https://www.reddit.com/r/todayilearned/comments/1gnga1r/til_in_the_how_the_grinch_stole_christmas_2000_in/