Two friends speed down the highway at 90 mph.
“Hey,” asks the driver. “Do you see any cops following us?”
The passenger turns around. “As a matter of fact, I do.”
“Oh No!” says the driver. “Well we only have to stop if if the flashers are on. Are the flashers on?”
The passenger turns around again. “Yup. Nope. Yup. Nope. Yup.”