Never made a public or on-camera appearance out of character.
Once went to the doctor about an ear infection, and the doctor removed a cherry pip from his ear.
Once while in Atlantic City, NJ, he was cracked over the head with a cane by a young boy who thought Curly's head was as tough as it appeared to be in The Three Stooges shorts.
Shared the same nickname, "Babe," as another contemporary rotund slapstick comic, Oliver Hardy, although it was a coincidence. Curly was the youngest of the three Howard brothers--the others being Moe and Shemp--and his mother always called him "My Baby." His brothers shortened it to "Babe" and used it to constantly tease him. The nickname stuck to him all his life.
Some of the animators at Disney had seen him as "Curly" in The Three Stooges shorts. His movements inspired some of the choreography in the mushroom dance in Fantasia (1940).
Son of Sol Horowitz.
The accident he had as a child, which gave him his limp, was a gun accident. One morning he was playing in the backyard, with his pistol, and it had a hair trigger. He accidentally shot his foot and was so frightened of surgery that he never got it fixed. Moe was the one who found him. To mask it on screen, he developed his famous exaggerated walk.
The final pie-fight scene of Half-Wits Holiday (1947) did not include Curly because he had suffered a stroke the day the scene was filmed.
The identity of Curly's first wife remains a mystery to this day. The marriage was annulled after five months because his mother didn't like the idea of him marrying in only his late teens.
The original use of "woo-woo-woo" was an ad lib. It was actually written into the later scripts.
Unlike his character, he was very shy and withdrawn when not on camera.
Was an avid dog lover and often brought stray dogs home with him from traveling.
With a full head of hair, appears for the first time with both Moe and Shemp in The Three Stooges short Hold That Lion! (1947); it was also his last Stooge appearance.