The current trend on social networks is to send out an "ice bucket" challenge to three people to raise awareness for ALS (Lou Gehrig's disease).
The person then has 24 hours to complete the ice bucket challenge or they have to make a donation to the ALS charity.
Each person then can nominate three more people to complete the task.
Disney CEO Bob Iger took part in the ice bucket challenge and nominated The Avengers 2 star Robert Downey Jr. (as well as Chris Pratt from Guardians of the Galaxy), with RDJ in turn nominating Thor star, Chris Hemsworth.
You can also check out Kate Mara, who is starring in Fantastic Four, below as well.
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