According to ALS Ice Bucket Challenge, a person is required to dump icy water over his/her head and if he/she fails then they must donate an amount to the ALS association.
Every participant who was challenged had to complete the task within 24 hours, if not then that person became liable to donate funds to the ALS association. This went viral throughout the social media.
There were celebrities like Robert Downey Jr, Selena Gomez, Taylor Swift, Lady Gaga, etc performing this challenge. We also had Justin Bieber, who went one step ahead everybody by challenging President Barack Obama, who of course declined it.
Interestingly, the ALS association raised about 13.3 million dollars due to this activity.