沒再細問，迷信的東西哪裏還會有原因？我古狗了一下，還出問題了

According to this, he should give ME a penny :

superstition states that you should give someone a coin when they give you a knife. I've heard two reasons for this. The first says that it is to ensure that the knife doesn't cut the owner; the second reason, which I've heard more often, is that it is to ensure that the knife does not cut the friendship between the giver and the recipient.

所有跟帖： 

• More on the topic on knife superstitions -色大膽小- ♂ (2336 bytes) () 04/27/2012 postreply 08:46:20

• 原來如此，給了一分錢送刀就變成買刀。中國人送鍾也可以照此辦理 -徒勞- ♂ (0 bytes) () 04/27/2012 postreply 09:09:01