If you haven't noticed already, celebrities are pouring buckets of ice cold water over their heads to raise awareness for ALS. When a celebrity becomes nominated, they have to pour ice cold water over their head in the next 24 hours or donate money to ALS.
Mark Zuckerberg took on the challenge and nominated Bill Gates. Mr Gates' video may be the best though. It looks as though he got a whole production team together to do his video and even made an apparatus to make the job easier!