The ice bucket challenge video, social media’s latest charity campaign, was designed to raise money and awareness for the neurodegenerative illness ALS through the ALS Association and UK based charity, Motor Neurone Disease Association. It has basically taken the Internet, and all of the celebrities, by storm. When we got a hold of Chris Hemsworth and David Beckham's videos yesterday, we thought nothing could top them but that was before we saw Britney, former President George Bush and Zac Efron among others take up the challenge. These are just hilarious.

Eddie Redmayne & I do the #IceBucketChallenge for @mndassoc - http://t.co/7ApG3D912Z Visit http://t.co/hPkdvBAd7X . In the face! — Jamie Dornan (@JamieDornan) August 19, 2014

Zac Efron. No, he's not topless but we'll still take it. George Bush. Obama didn't take up the challenge but former President George Bush certainly did. Britney Spears. This HAS to be the best reaction yet. Ray D'Arcy He may have been on holidays but that didn't stop Ray getting involved in a good cause. Kaley Cuoco Sweeting. She's just so damn cute. Jim Parsons and Mayim Bialik. These guys just had too much fun. Dave Grohl This has to have the most effort we have seen yet Tom Cruise and Chris McQuarrie. Cruise is just a hero. 9. Nick Offerman. What a man.