Small difference, Big difference?

A sentence without a comma is a drastic difference from a sentence with a comma, but if you want to know what REALLY changes a sentence, it's a colon!

Here's an example:

"I ate my friend's lunch."

"I ate my friend's colon."

"Let's eat, grandma!"
"Let's eat coma grandma!"

One is a pause in speech, the other a pause on life.