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ALS ICEBUCKET CHALLENGE:

The Ice Bucket Challenge, sometimes called the ALS Ice Bucket Challenge, is an activity involving dumping a bucket of ice water on one's head or donating to the ALS Association in the United States. It went viral throughout social media during the Northern Hemisphere summer of 2014.^[1][2]

The challenge dares nominated participants to be filmed having a bucket of ice water poured on their heads. A common stipulation is that nominated people have 24 hours to comply or forfeit by way of a charitable financial donation
(source: Wikipedia)