Flip out? Not recently. My worst flip out was after a guy sideswiped me. I was waiting in an LTO lane and he sped through a right-on-red from my left, came really wide into my lane and hit me with the fender blister on his duallie. Spun me down and broke my pannier, bloodied up my leg, etc. When he had the audacity to stop so he could tell me how he was going to sue me for the damage to his truck, I picked up my bike and broke his windshield with it, then kicked out a headlight for good measure. The situation did not end well for either of us.
My most recent was just last summer when a guy stuck in traffic thought it would be funny to swing right and block the bike lane as I was approaching. Since he wasn't going anywhere I stopped, got up on the sidewalk next to his passenger window, pressed a big sweaty assprint on the window, and then rode off on my way.
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"I feel like my world was classier before I found cyclocross."
- Mandi M.