The Ice Bucket Challenge is well underway, and tons of people have been called out to take the challenge already. It involves dumping a bucket of ice water over a person's head within 24 hours or donating money towards fighting ALS. Here are the best challenges taken to date which includes celebrities, the top business executives and more.

1. Satya Nadella, Microsoft CEO.

2. Tim Cook, Apple CEO.

3. Jeff Bezos, Amazon CEO.

4. Jimmy Fallon, Tonight Show host.

5. The Rock.

6. Conan O'Brien

7. Taylor Swift.

8. Justin Timberlake.

9. Larry Page and Sergey Brin.

10. Bill Gates. Nerdy invention wins.