I think that you should watch this. It's very funny. I know, some of you may be "on the fence" b/c you've heard there's "violence", but it's all played for laughs. I am an avid nerd of Pixar movies, so I fully support those who choose to watch this. The reason I chose "4+" is b/c some of the jokes may totally go over some younger viewer's heads, but, then again, if you have a kid who's very intelligent for their age (I've always been that way), it shouldn't be an issue.
You know pixar actually makes better short films than other short films. The short film "Knick Knack" was very probably my least favorite short film because the sexual behavior in that short film wasn't age appropriate like how a snow-globe snowman is motivated to escape his glass home when he sees an attractive bikini-clad mermaid toy. Not a funny short film. But good. Also in the end of a short film called "For the Birds", all birds except for the giant bird was naked. Compared to most short films, they have heavy cartoon violence. But I don't care that much because I really like it!
My dad told me to stop playing games once, and then he told me to watch a movie. My older sister wanted to watch this one because she thought that would be good, but I was like a night owl, not on a school night.