HOLYOKE -- Mayor Alex Morse donned casual clothes on Friday as he prepared to get wet.

Morse participated in the 'Ice Bucket Challenge," to raise awareness for Amyotrophic Lateral Sclerosis, commonly known as ALS or Lou Gehrig's Disease.

The idea behind the challenge is simple. Someone challenges another to participate and within 24 hours they must record dumping a bucket of ice water on their heads and post the video to social media. If a person challenges refuses to participate, they must donate $100 to an ALS charity.

Boston Mayor Marty Walsh did it. Boston Bruins forward Gregory Campbell also did it. Part-time Northampton resident Rachel Maddow, host of MSNBC's "The Rachel Maddow Show" even was soaked. But why?

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The idea behind the challenge came from former Boston College baseball player Pete Frates, who was diagnosed with ALS in 2012. He and fellow ALS patient Pat Quinn challenged their social media followers to dunk or donate.

Morse was nominated by city employees City Clerk Brenna McGee and City Councilor Jim Leahy as well as several friends.

In addition to accepting the challenge, Morse said he will donate $100 to the Pete Frates #3 Fund.

Prior to being soaked, Morse called out his fellow Western Massachusetts mayors. He challeged Springfield Mayor Domenic Sarno, Westfield Mayor Daniel Knapik, Northampton Mayor David Narkewicz and Easthampton Mayor Karen Cadieux.

According to the challenge rules, the four have 24 hours to participate or donate.