Steven Universe - No fun allowed. It could hurt Steven.

The answer is love

It reminds me of one of those old movies with psychic talking animals (pre-Murphy's Dr. Dolittle, so no CGI to sync lips), where one dog is asked its name.

"What's your name?"
"Uh, I don't know. How do I know it?"
"Your name is the word humans say to you the most often."
"In that case, hello my name is No."