The ALS Ice Bucket challenge emerged in the summer of 2014, in which people emptied a bucket of ice cold water over their heads and then donated money which would be used for conducting research into the fatal neurological disease, Amyotrophic Lateral Sclerosis (ALS). Once done, they would nominate others who were to do the same.
Social media was brimming with Ice Bucket Challenge videos, and people emulated celebrities like Mark Zuckerberg, Tom Cruise, Charlie Sheen, and Robert Downey Jr who did the same.