But the goal was not only to raise awareness of ALS — also known as Lou Gehrig’s disease, named after the legendary baseball player who was diagnosed with it in the 1930s — but also for participants to briefly feel the shock that mirrors some of the physical symptoms people with ALS may experience.

Over a decade after the viral "ALS Ice Bucket Challenge," these college students sparked a new trend in support of mental health. Reactions are mixed.

The Ice Bucket Challenge went mega viral in 2014, but it's back again. Here's what to know about 2025 challenge, rules and what cause it supports.