Well for starters it was a spoof of the Denny Hamlin commercials. The last letter came from someone named NA...PA as Mikey stated. Put NA and PA together and you get NAPA. Then Mikey said the letter wasn't very nice which pretty much is NAPA making a joke of themselves for sucking so much. The ad was for NAPA and they wrote a nasty letter to Mikey. Think of it as a spinoff of the Sammy Hagar commercial where Sammy asks Mikey if he can drive a little faster. I'm doin my best here to clear it up so hopefully this helped.