A man walked into a library and asked the librarian, "Do you have any books on Pavlov's dogs and Schrödinger's cat?"
The librarian replied, "It rings a bell, but I'm not sure if it's here or not."
The man laughed and said, "Well, that's a real paws-itive response!"
The librarian groaned and said, "You're really milking this joke, aren't you?"
The man replied, "I'm just trying to cat-ch your attention!"
The librarian face-palmed and said, "That's claw-ful!"
The man grinned and said, "I guess I've reached the purr-plexity limit!"
The librarian shook her head, laughing, and said, "You're barking up the right tree, but I think we've exhausted this joke!"
The man chuckled and said, "I guess it's time to paws for a moment!"
The librarian smiled and handed him the book, saying, "Here, take this and leaf me alone.