CB radios often had a “PA” switch that sent your microphone audio to a loudspeaker under the hood

We used to roll those back in the day. A friend gave my very drunk self a lift home one evening and I used it to give commentary to a group of revellers on the side of the road… who threw a beer bottle at us, and then chased the car which luckily didn’t get stopped at the traffic light nearby.

Good times.