People in Boston poured buckets of ice water over themselves and got drenched during an event to mark the fifth anniversary of the Ice Bucket Challenge, a viral activity aimed to raise money for research into the ALS disease, on Monday. /VCG Photo

The social media sensation that spread in 2014 was started by co-founders Pete Frates and Pat Quinn, who were both diagnosed with amyotrophic lateral sclerosis, or ALS. /VCG Photo

Since then, more than 17 million people have participated and posted videos of them getting drenched, NBC Boston reports. /VCG Photo

The viral challenge has reportedly helped raise more than 220 million U.S. dollars in the search for an ALS cure. /VCG Photo.