James McAvoyhad a very physical reaction to hisLate Night with Seth Meyersinterview last night.
To which an alarmed Meyers replied, Why are you standing up?
McAvoy quickly cleared the air.

James McAvoy suffering a cramp on ‘Late Night With Seth Meyers’.Late Night with Seth Meyers/YouTube
Im not gonna fart!
He prefaced as the audience burst into laughter, before leaning backwards and letting out a groan.
Late Night with Seth Meyers/YouTube
The actor then adjusted his jacket and took his seat again.
Meyers asked of McAvoys sudden spasm.
I wouldve been so happy if the reason you stood up was to fart.
McAvoy replied, I would not have been happy, I can tell you that.
Meyers then joked that McAvoy was showing off with the move.
Why, because I had a cramp?
Consider McAvoy, who was wearing an all black ensemble, pleased with Meyers' compliment.
Seth likes my clothes, he teased.
Seth said he liked my clothes.
“Can I say something?”
Meyers asked as he looked at the photo of McAvoy at Dorney Park.
“This is the most American I’ve ever seen you look.
This guy stands to fart.”
Watch McAvoy suffer a cramp in the video above.