Matt Damon, Lady GaGa, Bill Gates, George Bush, Oprah Winfrey, and Mark Zuckerberg are just some of the high-profile people to have taken part in the Ice Bucket Challenge, and helped contribute to the more than $88.5 million (£53.4 million) raised for the ALS Association in the past four weeks.
But there are some who have received nominations that can be forgiven deciding to not take part, and one of them is Kurdistan’s deputy prime minister, Qubad Talabani.
On Monday, after numerous nominations, Mr Talabani apologised to his 44,000 Twitter followers for not joining in with the challenge yet, and explained why.
“Apologies for not accepting #IceBucketChallenge’s yet. Currently helping to run a government, manage a humanitarian crisis & win a war,” he tweeted.
In pictures: The famous do the ice bucket challenge
In pictures: The famous do the ice bucket challenge
1/16 Lady Gaga
Lady Gaga managed to keep an admirably straight face as she poured what looked like a solid silver bowl of cold water over herself
2/16 Homer Simpson
Fans were overjoyed when their favourite yellow cartoon character got involved in the campaign to raise money to help those suffering from ALS. As per usual with Homer Simpson, things escalated quickly
3/16 Reece Witherspoon
One of those who have arrived slightly late on the scene, actress Reece Witherspoon looks nervous but resolute as she has a bucket of ice-cold water chucked over her head
4/16 Lily Allen
Lily wore a bikini as she self-administered her bucket of icy water. She thanked Jess Glynne for the nomination, and passed the challenge onto Mark Ronson, Millie Mackintosh and rapper Giggs
5/16 Daisy Lowe
Celebrity ALS Ice Bucket Challenge videos seem to be coming in faster than we can watch them - model Daisy Lowe is one of the most recent to get involved. She was nominated by Sun journalist Dan Wooton, and passed it on to radio presenter Nick Grimshaw and Abbey Clancy
6/16 Bill Gates
One of the first to go viral on YouTube, Bill Gates had freezing water tipped over him in a bid to raise millions of dollars to fight the illness ALS
7/16 George W. Bush
It felt like quite an important moment when the former President of the United States accepted nominations from his daughter Jenna Bush Hager, golfing champion Rory McIlroy, Woody Johnson, and Jim Harbaugh. He nominated 'my friend Bill Clinton'
8/16 Jimmy Fallon
In an official letter this week, the ALS Association said: 'Never before have been in a better position to fuel our fight against this disease.'
NBCU Photo Bank via Getty Images
9/16 Tom Hiddleston
Amyotrophic lateral sclerosis affects the brain and the spinal cord. Motor neurons degenerate and die which makes it increasingly difficult to move muscles
10/16 Rita Ora
There is no known cause of ALS, though there is a proven hereditary factor in some cases
11/16 Taylor Swift
There is also no known cure, though the millions being raised by the ALS association will go towards researching these great unknowns
12/16 Oprah Winfrey
The illness is also known as Lou Gehrig’s Disease, named after the all-time great baseball player from the early 20th Century whose time at the top ended when he was stricken with the illness in 1939
13/16 Mark Zuckerberg
The Facebook founder is unarguably the master of the challenge, who – following his drenching – saunters off
14/16 Justin Bieber
Bieber's first attempt was pretty naff: he didn’t quite get it and decided not to use ice or a bucket to complete the challenge. Obviously, the internet moaned at him and he was brilliantly peer pressured into having another go
15/16 Justin Timberlake
Celebrities have been nominating one another to do the challenge
16/16 Christiano Ronaldo and Marcelo
The challenge is now making its way over to this side of the Atlantic, former Manchester United players Paul Scholes and Gary Neville both doused themselves in cold water for a terminally ill fan
And he can be forgiven for pouring ice water on his nominations of late, as Kurdish fighters are currently battling to stop the advance of Islamist militants in Iraq, who have mostly routed Kurdish forces in the north of the country in recent weeks, seizing more towns, oilfields and the strategic Mosul dam.
While the Kurdish Peshmerga troops have since reclaimed the dam, the fight is far from over. US and European countries have now begun arming and co-ordinating with the Kurdish army to aid their offensive against the militants.
Apologies for not accepting #IceBucketChallenge's yet. Currently helping to run a government, manage a humanitarian crisis & win a war— Qubad Talabani (@qubadjt) August 25, 2014
Mr Talabani is not the only politician to have opted out of the challenge; President Obama declined to take part in filming himself being drenched in ice water but he has donated to the ALS association. President Putin was nominated by Vin Diesel, though the Russian leader has yet to comment on the subject.
Video: Celebrities take on the ice bucket challenge
The Ice Bucket Challenge has raised more than $88.5 million (£53.4 million) for the ALS Association, a notable feat for an organisation that only made $2.6 million (£1.6 million) in the same four-week period last year.Reuse content