Younger Scout: How can I tell the difference between a mushroom and a toadstool(毒菌) ?
Older Scout: Just eat one before you go to bed. If you wake up the next morning, it was a mushroom.

年少的童子军:我怎样才能把蘑菇和毒蕈区别开呢?
年长的童子军:上床前吃一个。如果你第二天早上醒来,那就是蘑菇。