Here are the rules as I know them...
1. When the subject of a sentence, always use 'Mikey and I'
ex - Mikey and I went to the dance.
ex - Mikey and I laughed so hard, we almost peed our pants.
2. When part of a prepositional phrase, it's always 'Mikey and me'
ex - He smiled at Mikey and me.
ex - He bought lunch for Mikey and me.
3. When the object of an action verb, it's always 'Mikey and me'
ex - He took Mikey and me along for the ride.
ex - He passed Mikey and me in the hall.
A good rule of thumb... if you remove 'Mikey', would you say 'me' or 'I'?
I went to the dance.
I laughed so hard.
He smiled at me.
He bought lunch for me.
He took me along for the ride.
He passed me in the hall.
Now, here's where it gets tricky...
4. When the object of an intransitive verb (non-action verb), it's always 'Mikey and I'
ex - The only two left in the contest were Mikey and I.
In common speech, most people would, "The only one left was me." But this is actually grammatically incorrect. We should say, "The only one left was I." Sounds totally stupid, so my rule of thumb doesn't really work in this case. :wacko:
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Oh, 'me and Mikey' is never grammatically correct, and should only be used in informal dialogue.