George W. Bush is the latest to take the plunge for ALS.
In a cell phone video posted to his Facebook page Wednesday morning, Bush says although he's been challenged multiple times, he's reluctant to follow through.
"I've been challenged by multiple Americans to bring awareness to the ALS campaign: Woody Johnson, our daughter Jenna Bush Hager, coach Jim Harbaugh and recently Rory McIlroy," Bush said.
"To you all who've challenged me, I do not think it's presidential for me to be splashed with ice water, so I'm simply going to write you a check," he added.
Mrs. Bush apparently had other ideas. Later in the video, she dumps a full bucket of water over W.'s head, saying, "That check is for me. I didn't want to ruin my hair style."
Staged? Almost definitely. Still hilarious? Absolutely.
Bush has now challenged fellow former president Bill Clinton to the challenge. Clinton turned 68 Tuesday. Bush said, "my gift to Bill is a bucket of cold water."
Watch the full video above.