Conan O’Brien has joined the list of celebrities and several of your Facebook friends. The talk show host admitted to being called out by many different people to take the ALS Ice Bucket Challenge in order to raise awareness. ALS is also known as Lou Gehrig’s disease.

The ALS Ice Bucket Challenge has been a viral sensation all week on social media. In case you haven’t seen it, a person who has been “called out” dumps a bucket of ice cold water on their head while being videotaped. If they don’t agree to the challenge, they should donate $100 to ALS. (And even if they do the challenge, they should also send the charity a $100.) Then, that same person gets to “call out” a few of their friends or family members to do the same.

O’Brien’s schtick during the challenge was that he thought that he was going to get paid $100 to dump ice cold water on his head, not the other way around.

Check it out:

O’Brien called out Jimmy Carter, Pelé, and Haley Joel Osment. We’ll see if they abide and perform the challenge. Several big celebrities have gotten into the game including: Justin Timberlake, Martha Stewart, Mark Zuckerberg, and Jimmy Fallon.

Whether you personally enjoy watching people pour ice cold buckets of water on their head or not, one can’t argue with the success of the campaign. It’s being reported that the movement has raised over $5.5 million for the ALS Association since July 29, compared to $32,000 during that same period one year ago.

Here’s video of a few more celebrities performing the challenge:

Mark Zuckerberg

Martha Stewart

Michelle Wie

The ALS Association’s definition of the disease:

Amyotrophic lateral sclerosis (ALS), often referred to as “Lou Gehrig’s Disease,” is a progressive neurodegenerative disease that affects nerve cells in the brain and the spinal cord. Motor neurons reach from the brain to the spinal cord and from the spinal cord to the muscles throughout the body. The progressive degeneration of the motor neurons in ALS eventually leads to their death. When the motor neurons die, the ability of the brain to initiate and control muscle movement is lost. With voluntary muscle action progressively affected, patients in the later stages of the disease may become totally paralyzed.

If you would like to donate money to the association or help out in any way, you can click here.

Image via YouTube Screenshot