Dinosaur Bones

I adapted this joke to be a Nasruddin joke by setting it in the Ankara Natural History Museum, a.k.a. Şehit Cuma Dağ Tabiat Tarihi Müzesi.

Nasruddin was working as a security guard in the dinosaur section of the Ankara Natural History Museum.
One day a visitor to the museum pointed to the biggest of the dinosaurs on display and said, "Excuse me, sir. Do you happen to know how old those dinosaur bones are?"
"They are 152 million and four years, seven months old," Nasruddin replied, smiling proudly.
"That's amazing! How can you be so precise?"
"Well, when I started working here, they told me the bones were 152 million years old," replied Nasruddin. "And I started working here four years and seven months ago."

For another joke about Nasruddin and math, see What's 2+2? What I especially like about this joke is that in his "foolishness," Nasrudding is helping us to see something important: although the numbers might look the same, they are not! To say something happened "four years and seven months ago" is totally different than saying "the apatosaurus lived 152 million years ago." Numbers may look precise, but they are precise in different ways. You might think you can just mix and match, but as the joke tells us: nope, you cannot. The result would be, well... a joke!

Here's an apatosaurus that did indeed roam the earth appx. 152 million years ago:

Apatosaurus louisae