HighWay 166:

A police officer had just pulled over a car full of nuns for going too slow on a major highway.

Police officer: "Why were you driving so slowly?"

Nun driver: "I kept seeing all these signs with the number 20 on them and figured that was the speed limit."

Police officer: "No, Sister, that is the highway number."

Nun: "Oh, I'm so sorry, Officer, I didn't know that."

Then the police officer looks into the back seat and sees that the nuns there have panic-stricken faces and white knuckles from holding on to each other too tightly.

Police officer: "What's wrong with the nuns in the back seat?"

Nun: "Oh, we just got off Highway 166 a few miles ago."