Advanced Parentheses Puzzles: The Missing Comma Conundrum

In this puzzle, we will challenge your ability to recognize the difference between a sentence with a comma and one without. But don't worry, it's not as easy as it sounds...

Here is your sentence:

I went to the store, I bought some milk, I got home, I drank the milk.

Can you spot the missing comma?

Don't worry, you'll get it eventually. Or maybe not.