VIDEO — Mark Zuckerberg on ALS Ice Bucket Challenge: ‘That Was Really Cold’

You've probably seen videos making the round on your News Feed, with people getting doused with a bucket of ice water to raise awareness for Amyotrophic lateral sclerosis (ALS). Recently, Facebook Co-Founder and Chief Executive Officer Mark Zuckerberg responded to a challenge by New Jersey Gov. Chris Christie, and took the plunge.