Others though, make serious intentionally funny. Ed Asner has a knack for that. In response to a question about what he attributed Betty White's longevity in show business he answered "all the trips to Romania to get those monkey gland shots."
It's the art of dry humor. Delivered deadpan.
Buster Keaton ("The Great Stone Face") pioneered the art in film comedy simply because he discovered the only way he could be funny was when he didn't laugh at his own jokes. His humor, coming from the era of vaudeville and silent pictures was largely physical. A subject he once covered with the apology, “I'm so sorry I fell down.”
Leslie Nielsen, who liked to sing but didn't really want to, preferred doing nothing although he once admitted, "Doing nothing is very hard to do. You never know when you're finished."
So, in summation, not only don't you have to sing, but you'll never be off-key and you'll never have to remember how the tune goes. And you won't have to decide what facial expressions to use because you only need one. (Which is easy on the facial muscles.) It's like simplifying your behavior. And your life.
Surely, that's a good thing.
(I know, I know. Don't call me Shirley.)