Me and I

Some years ago, I heard a jingle for an air conditioner over the radio.

The last line for the jingle went like this:

"Brand X, for a healthier you and I."

That line is grammatically incorrect. It should be:

"Brand X, for a healthier you and me."

Do you know why "me" should be used instead of "I"?

Here's the answer:

"for" required the object form of the pronoun. The object form of the pronoun "I" is "me".

If we remove "you" from the sentence, leaving only the first person "I", we can notice the mistake better:

"...for a healthier I."  --> Incorrect

"...for a healthier me."  --> Correct