當無咗支鉛筆 ， 參加者都判別得到真假笑容 但有支鉛筆響個口度嗰陣 佢哋唔能夠模仿見到嘅笑容 而佢哋嘅判斷就有誤差
When there is no pencil, the participants can tell if they are smiling or not, but when a pencil rings in their mouths, they cannot imitate the smile they see, and their judgment is wrong