A wolverine that sticks its legs in rice will become very solemn, very fast. This is weird to you because wolverines always seem so happy. Well his dad died from his legs getting stuck in rice, so just leave the poor solemn creature alone.
Remember how solemn wolverine looked when his dad died? You hated seeing him like this so you ran up and shook (しゅく) him. You shook the solemn sadness right out of him! You should do that again now!