People like that were my inspiration on commutes. I would be timing the lights and on my fixie so I wouldn't have to slow or stop and I would get passed by someone who would fly by and slam on their brakes.

I would make it my mission to not only pass them, but to smile, nod and make sure they knew what getting passed felt like...and I would make sure I dropped them if possible as quick as I could.

I know its a little alpha type behaviour....but it really makes the 20km commute to work go quicker!