Actor Samuel L. Jackson enjoys watching his films in public movie theatres so he can gauge fans' reactions to his work.
The Pulp Fiction star admits his impromptu appearances often cause a stir.
He tells the London Evening Standard's ES Magazine, "I grab my popcorn and my big slushie and I sit on the end of a row, up high so I can see people’s reactions. They normally spend the first half hour tweeting, and then they calm down."
Many ticket-holders couldn't get into the O2 Arena show on Tuesday night (September 19th) because they didn't bring photo ID to match their booking.
An album re-release, a new song and a documentary mark the singer's legacy this year.
The film will be the first in the Marvel Cinematic Universe led by a person of colour.
The actor plays the titular hero in the forthcoming adaptation.