Dear Guy on the Mountain Bike:

Take me through this. We're on the north branch of the lakefront path, by Foster. You're behind the guy on roller blades who had his pit bull on a lead. You see me coming toward you, in the aero bars. What made you decide that our moment of intersection would be the perfect time for you to pull out and pass rollerblade/dog walking guy?

My perspective: Cruising along ~20 mph, in the aero bars, path clear in front of me. I note dog/blade guy. Dog is out of harm's way. Guy is blading sanely. Then, all of a sudden, you come blasting up behind him and charging at me. I shriek, "GACK! ", and have to make the split second decision to try to get out of the aero bars as I veer off the path onto the gravel and grass, and maybe lose complete control of the bike, or stay in them and control the bike with my forearms alone.

Not that you care, but I went off the path, toward the tree, back on the path, and carried on, still in the aerobars. I'm proud of myself, but mighty ticked off at you! Dude! Pay attention! I doubt you even looked back when you heard me scream.