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In Dumb and Dumber (1994), Jim Carrey improvised the “most annoying sound in the world” scene, and Jeff Daniels and Mike Starr’s reactions were genuine because they weren’t expecting it, with Daniels often just repeating Carrey’s improvisations.

In Dumb & Dumber (1994) "the most annoying sound in the world" scene was improvised by Jim Carrey. You can see Jeff Daniels react in the moment to the out of the blue question and then break as soon as Carrey makes the noise.