The Ice Bucket Challenge involves daring a person to dump a bucket of ice water over their head within the next 24 hours, or else donate money toward fighting ALS. Even if a person completes the challenge, they're more than welcome to donate money too.

Once a person completes the challenge, they're also supposed to dare several other people — usually three — to participate, which is why the challenge has been growing and growing. We've collected a ton of our favorite Ice Bucket Challenges for you to watch right here.