#BBCtrending: When the Ice Bucket Challenge spread to Iran
5 September 2014 Last updated at 22:39 BST
The Ice Bucket Challenge - where people soak themselves in icy water to raise money for ALS - has spread worldwide.
But when Iranians tried to give money to the Amyotrophic lateral sclerosis (ALS) Association - the main US charity people to donate to - sanctions on the country meant they couldn't.
That, plus other levels of confusion and a water shortage in Iran, mean those doing the challenge in Iran have had to adapt, as #BBCtrending reports.