Disclaimer: I'm not writing this to get some compassion, just to get it off my chest.

I was riding to work this morning, not even 10 minute into my commute, still on my street.
I take the lane usually because there are cars parked on the side of the road, and there's a blind corner anyway. Safer that way. I've never had a problem until this morning.
As I take the lane, I see two cars behind me, the one right behind me driving quite close. One of the cars honks, I assume it's the one behind me. I turn around and yell "What!". The driver (a lady) makes some gestures which I take to be aggressive towards me. So I yell back some obscenities, both the cars pass me revving up their engines. At the set of lights up ahead, the lady driver somehow ended up behind the car that was behind her, so the other car passed her as well in the process of passing by me, a fact I completely missed.
Feeling frisky, I yelled at the lady "What makes you think your time is so important". To my chagrin, she yells back "It wasn't me that honked, it was the black car". The black car was gone by now.
At this point, I'm feeling like a dick, so I yell back "Sorry about that, I was confused". We go through the green light and she passes me, then she pulls over, I'm thinking to give me an earful, which I completely deserve at this point. I pass slowly, and she's bawling her heart out. Feeling like a dick +100 right now. I stop, and we chat a bit. She was up all night with a little one (me too), and now she couldn't find a house she was supposed to deliver a news paper to. I explain the geography a bit, and apologize a few more times, feeling like such a d0uche.
I could think of nothing I could do to help her at that point, though now I realize I could have tied up my bike and drove back with her to look for the house.
I have a mind to search for the other car and leave a note on their windscreen with details of the incident and my intent to file a police report if it ever happens again.

Anyway, that's my confession for the day. I hope to be a bit more cool headed next time and just smile and wave to the dickheads I encounter. I guess it would be fair to acknowledge that this is the first time I've been honked at by someone in the past 3 years. I did not handle it well.