Pro tip if you're handing over money: give the coins first, and then notes. It makes it much easier, because coins on top are likely to slip off and require more careful handling.
Yeah in truth I haven't used physical money in ages either. Tap to pay is so much more convenient, and even before cards started having that, inserting and entering your PIN was still way more convenient than the annoyance of cash. If I find out a place doesn't take card, I'll usually just walk out.
I was at home, playing with my cat Leo, when in a span of 30 seconds, he went from being perfectly fine, to not being able to move his back legs, dragging himself along the ground, and yowling in pain. I needed to get him to the emergency vet quickly. The car in front of me pulled this, driving slow, blocking the road, not letting me get around him. Unfortunately Leo didn't make it, and that driver's behavior played a huge part in the lasting personal trauma I'm still dealing with.
The thing is, you don't know why they are driving the way they are. Maybe they are an ass hole, but maybe they have a medical emergency. It isn't your job to enforce the traffic laws. I know I'll never do it again though
If someone is driving recklessly or tailgating they're the ones creating the problem, not the person choosing to respond by slowing down slightly. Driving 2 mph under the speed limit isn't exactly grinding traffic to a halt. If someone is driving dangerously around me I'd rather force them to slow down if it makes things a bit safer.