Ten of the best celebrity ALS Ice Bucket videos

The ALS Ice Bucket Challenge, is an activity involving dumping a bucket of ice water on one's head or donating to the ALS Association in the United States.

The challenge required nominated participants to have a bucket of ice water poured on their head. One common stipulation gives 24 hours to complete the dare from the time they are nominated; otherwise, the participant has to donate $100 to charity.

Here are ten of the best:

"Weird Al" Yankovic

Bill Gates

Taylor Swift

Cristiano Ronaldo

Jennifer Lopez

Jessica Alba, Gavin Rossdale and Nicole Richie

Lebron James

Oprah Winfrey

Steven Spielberg

Chris Pratt