Former US President George W Bush takes the "Ice Bucket Challenge" which aims to raise money and awareness for ALS, in this still image taken from video, Aug 20, 2014, courtesy of George W Bush. Bush posted video evidence of his soaking on Facebook. "Yesterday was Bill's birthday and my gift to Bill is a bucket of cold water," Bush said in his Facebook video, after being drenched by his wife, former First Lady Laura Bush. [Photo/Agencies]