Asked a librarian for a book about Pavlov's dog & Schrodinger's cat. She said it rang a bell, but she wasn't sure if it was there or not.

I asked a librarian for a book about Pavlov's dogs and Schrodinger's cat... She said it rang a bell but she didn't know if it was there or not.

One year later after Pavlov's dog death... Pavlov still brings him food.

A man goes into a library and asks for a book about Pavlov's dogs and Schrodinger's cat. The librarian says, ""It rings a bell, but I don't know whether it's there or not.""