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一位顾客回到商店，因为他忘了带他半小时前买下的两本昂贵的词典。经理询问他是由谁为他服务的，顾客指向了站在柜台后面的那位女士。这位名叫卡罗琳的女士记不起他了，因为她为他服务的那位男士当时戴着帽子。经理要求顾客戴上帽子。当顾客戴上帽子后，卡罗琳终于认出他是当天早些时候为她服务的那个人。
A customer returned to a shop because he forgot to take the two expensive dictionaries he had bought half an hour ago. The manager asked him who served him, and the customer pointed to the lady who was standing behind the counter. Caroline, the lady, could not remember him because the man who she served was wearing a hat. The manager asked the customer to put on his hat. After the customer put on his hat, Caroline finally recognized him as the man that she served earlier that day.