Only real comical commuter race I've had was ages ago when I had a cheapo second-hand
halfords bargain basement bin full-susser, which was so heavy I think it was made of cast iron. Anyway I was batting along, and waterproof-trousered-pannier-woman comes pedalling furilously past on the outside, on her probably equally cheap but much lighter and slick-tyred rigid. She goes straight through the (red) lights at the end of shalesmoor. I follow, and continue to draft her for about a mile. Then, having saved up some energy I feel ready for an overtake, so accelerate past her. I would have made it comfortably past, but right in the middle of my overtake I decide my cadence is too fast to accelerate much further and that I need to be on my big chainring, so I twist the grip-shifter (in mid overtake)
grind...grind...grind!! shoot!
I eventually manage to get it on the big ring and continue the overtake, but it took longer than I'd hoped and had to absolutely knacker myself out to stay in front, and fortunately my turn off where she went straight on came just at the point where I couldn't maintain any more than about 13mph.