There are a few sentences that make me chuckle and are my go-to examples when sense checking punctuation; particularly comma usage.
“The bear eats shoots and leaves.” — that’s a normal bear.
“The bear eats, shoots, and leaves.” — that bear is a criminal.
“Have you eaten, Grandma?” — is a perfectly reasonable question.
“Have you eaten Grandma?” — is suggesting cannibalism.
The little things matter. Even commas.