Something Light - Nun Driver

A police officer had just pulled over a car full of nuns for going too slow on a major highway. The conversation went like this:

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."

Officer: "No, Sister, that is the highway number."

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

Then the officer looks into the backseat and sees that the nuns there have panic-stricken faces and white knuckles from holding onto each other too tightly.

Officer: "What's wrong with the nuns in the backseat?"

Nun driver: "Oh, we just got off Highway 101 a few miles ago."