Oh my

In class on Friday we had an interesting language clash. We learned that "poopay" is the word for doll. I found that somewhat amusing but I try to pretend I am mature while I am in class so I didn't show it. Then my friend David raised his hand and asked the teacher, "Quelle est la difference entre une poupée et une doudou? ("What is the difference between a "poopay" and a "doo-doo"?)" I started laughing. I thought he was playing around with poor Valerie, who never understands our English jokes. Then, as she turned to write some kind of explanatory illustration on the board (which surprised me), he blurted out, "Oh wait! J'ai une doudou dans mon sac! (I've got a doo-doo in my bag!)" That pretty much killed me. He then pulled out a stuffed animal that he had packed for one of his sons and we all learned the difference. "Poopay" is doll, "Doo-doo" is stuffed animal. And Valerie still doesn't know why we all thought that was funny...