It's a money raising idea for charity which has become popular all over the world this summer.
People pour ice cold water over their heads and donate to a charity for research into Motor Neuron Disease (ALS/MND).
Then they give the names of two more people who should follow them - water and donation.
Hollywood movies stars, Bill Gates, sports stars, politicians, business leaders - many people have done it.
This week - suddenly - it is my turn.
Yesterday I was looking on Facebook at a friend in the Uk and her husband doing the Ice Bucket Challenge. Her video was noisy and I couldn't hear what she said. She is in costume and they are joking. It was funny.
Then I read the caption to the video...
"I nominate Amanda in Japan and XXX in Norway to do the challenge!".
Me! I played the video again and listened carefully. It is me.
What to do?
I have mixed feelings about this event.
On one side I think it is a fun way to raise money for a charity and medical research. ALS isn't such a well-known disease and research is under-funded. If people have fun and learn something, AND donate. That is good.
But, on the other side, I feel that people shouldn't be pressured into doing good. I like my friend, I want to make her happy - so I feel I should do it. But I don't like the pressure. I don't want to give other people pressure.
I give to charities (Fukushima people support charity at the moment) and that is my private decision. This feels like a pressure.
I know that my friend is waiting this weekend to see me do it - and show the picture or video on Facebook. If I don't, she will be disappointed. I have researched ALS support groups in Tokyo and Sapporo. I am happy to donate to them.
But I don't want to pressure two other people. Like chain letters - it just feels wrong to me.
What should I do?