[garblegarble]

>Seems like there's a joke about movies portraying chest wounds on one's left side being much more serious than on the right side

I'm guessing it's because your heart is on the left (unless you have situs inversus), so he's arguing movies treat a chest wound on the left as hitting the heart

[baking]

It's a movie cliche. Shot on the left side, you are a gonner. Shot on the right, you'll be just fine. So you don't have to worry about whether your favorite character is going to make it to the end of the movie or not.