Not everyone is a fan of the Ice Bucket Challenge. Count bombshell Pamela Anderson and Pink's husband, motocross racer Carey Hart, among the dissenters.
Why did both celebrities take to social media to criticize the viral craze?
For Anderson, a longtime supporter of animal rights, it boils down to the fact that she does not approve of ALS researchers using animal testing.
"Sorry, I can't bring myself to do your Ice Bucket Challenge," she said.
"I enjoy a good dare, It's always good to bring awareness - in fun, creative ways, I don't want to take away from that. Instead, I'd challenge ALS to stop animal testing."
The former Baywatch star, 47, denounced "recent experiments funded by the ALS Association" that she says exploited animals in medical experiments:
"Mice had holes drilled into their skulls, were inflicted with crippling illnesses, and were forced to run on an inclined treadmill until they collapsed from exhaustion."