Most surprising about the whole thing?
All it took to convince Tatum to play the part was a friendly email.
We have a very special role that we would like you to play, Rogen wrote at the time.

Credit: Astrid Stawiarz/Getty Images; Romain Perrocheau/Getty Images; Suzanne Hanover
I know this is crazy, but we really think it will get a massive laugh.
He added, yo dont take this the wrong way or be insulted by this.
We just think its a great joke and you would be great doing it.
To Rogens surprise, Tatum sent his three-part response within hours: One, what the f?
Two, thats the craziest sh Ive ever heard.
Three, when and where do I show up?
I think they were already filming.
That was a terrible idea, probably.
Hear Rogen read from his email below.