The latest internet craze, the Ice Bucket Challenge, has taken the world by (hail)storm.
Created to raise awareness for Motor Neurone Disease — or the umbrella term ALS (amyotrophic lateral sclerosis), — the challenger nominates somebody to either donate money to the cause, or tip a bucket of iced water on their head.
The challenge has been completed by many people, but the most awareness has been raised by celebrities.
Here are some of our favourites: