Nathan Fillion and Tom Hiddleston are up next to accept the ALS Ice Bucket Challenge.
The ALS Ice Bucket Challenge is a month-long campaign to raise awareness for ALS (Lou Gehrig's Disease).
Participants dump ice water over their heads, and then nominate three more people who have 24 hours to complete the challenge or donate $100.00 to the charity.
Many people are doing both.
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