英语笑话:Why is he howling 他为什么要叫唤

Dentist: Please stop howling. I haven't even touched your tooth yet.
 
Patient: I know. But you are standing on my foot!
 
牙医：请不要再叫了，我都还没有挨着你的牙齿啊！
 
病人：但是，亲，你可知道，你踩到我脚了！！！