Celebrate
If a spirit blesses your older brother it's time to celebrate! This isn't something that happens every day to everyone's older brother. Yours is very good and very lucky. So celebrate with him!
Imagine what celebrating would be like. Imagine an older brother too, if you don't actually have one.
しゅく, しゅう
いわ
None
Unfortunately, the two of you celebrated too much, and you went a little crazy. The spirit grabbed your brother and shook (しゅく) him. Shook him so hard his head popped off.
Never celebrate too hard. Otherwise you'll always have to think about the time a celebration spirit shook your brother till his head fell off.