You can blame the engineer for its deletion.
Eminem's "Stan" has gone down as a classic hip-hop narrative, and while each verse is an essential part of building one of rap's most infamous characters, the third 16, which finds Stan at his breaking point is easily the most chilling part of the record. Em's vocal performance is as important as his writing at this point in the story, and as effective as it came out, Em has revealed that there was actually a superior take of verse 3 that was erased by a stoned engineer.
You can read the rapper's annotation of the verse on Genius below. If you're a huge Eminem fan, you might want to sit down for this one.
Em also shared a couple of other thoughts on the beat and hook of the record. Read them below.