Greta Thunberg had the best response to that Celebrity Mastermind moment.

Casualty's Amanda Henderson went viral this week after she took part in the quiz and was asked the name of the Swedish climate change activist. "No One Is Too Small To Make A Difference is a collection of speeches made by a Swedish climate change activist," host John Humphrys asked her. "What's her name?" Rather than saying Greta Thunberg, she replied 'Sharon'.

i know we're only on day 2 but I am 100% certain this will make all the "tv clips of the decade" lists in 2029. i am dead RIP me x pic.twitter.com/JIvyTmOj5q

— michael segalov (@MikeSegalov) January 2, 2020

The moment quickly went viral, spawning countless memes and being viewed millions of times since the episode aired on Thursday. Eventually, Thunberg responded to the moment - changing her name on Twitter to Sharon, much to the delight of her followers. The name change - combined with the fact that it was Thunberg's birthday yesterday - led Happy Birthday Sharon to trend for a little while. The Mastermind moment comes a few weeks after it was revealed a Greta Thunberg documentary is in the works. Deadline reports that Hulu will air an original documentary set to premiere in 2020 with a working title of Greta. The team focusing on Thunberg has done so from her early school strike in Stockholm to the world stage, capturing footage during every significant step.