Despite the fact that everyone you know is growing tired of watching everyone you know dump buckets of ice water on their heads, there’s one more that you must see. It will remind you that the Ice Bucket Challenge isn’t just an excuse to act silly — it’s a very effective method to raise awareness and funds for ALS, a neurodegenerative disease that, if left without a cure, will almost surely kill the 30,000 or so people who currently have it within a few years.