This is related to academia in that many people use bikes for transportation in college towns, which usually involves some riding in traffic. This topic will likely appear again due to drivers' ineptitude and stupidity at handling bicyclists on the road.
I don't care how long you've been waiting at an intersection or how far you (dumbly) pulled your car into traffic. You do not tap your bumper to the back tire of a bike in front of you! Not only is it rude, but it is also a safety hazard. If you accidentally tap too hard and push the biker into traffic, the biker is getting squashed or thrown and likely injured. I hope you have good insurance.
That is all.