Stan is writing to his idol, Eminem, and is a little upset that he hasn't gotten a response back from Eminem, but is still very hopeful for a response. Stan writes about all the things they have in common and how he is Eminem's biggest fan.
A while has passed and Stan has still not received a response from Eminem and is growing a little impatient but still sympathizes with Eminem. He writes about how he is similar to Em as they come from similar backgrounds and Stan ends the letter off by saying that he wants a romantic relationship with Eminem.
Stan in a fit of rage kidnaps his girlfriend and starts drinking and driving. He plans to record his thoughts to send to Eminem.
Stan starts recording his voice. He mentions how is speeding on the freeway and how this is his final message. He also mentions that he kidnapped his pregnant girlfriend and stuck her in the trunk. Stan then tries to make Eminem feel guilty by telling him he could've saved them if he just responded. Stan then looses control and drives his car into a river.
Eminem is writing his letter back to Stan. He sends Stan some souvenirs and tells him that he meant to write back sooner, but has been busy with other things. He also tells him that sSan should get some help before he ends up on the news for doing something crazy like the guy who drove his car off a bridge with his pregnant girlfriend in the trunk. Eminem then comes to realization that Stan was the crazy guy.