F=MA. My M is 185 lbs (and falling fast) and my A at the time of "the incident" was moderate - I was accelerating. Which makes my F not inconsiderable when I got hit by a car - who's M is...well, how much does a Caddy weigh? This muttonhead pulled out onto 33rd street from the curb after having parked the wrong direction on the wrong side of the street - and he just pulled right out. I saw him, but there was nothing I could do - I hit my brakes but not nearly fast enough. (curiously - from a physics point of view, deceleration is the same as acceleration in the above formula). My front wheel kissed his bumper and skimmed off the side, and my right leg shot out, banging my shin off the bumper, and then I slammed my foot on the grill and shoved with all my might.
This changed my forward momentum into angular momentum - but the vector of the force was sideways and to my rear because of the forward motion of Mr. Muttonhead's gigantic lux-o-mobile. This caused me to bounce forcefully off of the front of his car with my legs flying off the bike and behind me. However - my body was still moving forward (along with the bike) - so I stretched out at full length in mid air.
Now, recently I hurt my shoulder by completely blowing a fairly simple roll, the kind we practice in Aikido. What was flashing through my mind (at lightspeed) was "If I die doing a face-plant into 33rd St., Sensei will never forgive me." - Somehow, I managed to get my legs back underneath me, entirely on the far side of the bike, and landed in a crouch. I was still moving forward at a significant rate, however, so my crouch turned into a twisting bounce - because I was still trying to keep an eye on the DeathCar. I jumped up, landed facing backwards from my original vector of movement, and glared sharply at the idiot behind the wheel - who had pulled away from the curb without bothering to see if there was any oncoming traffic.
Indignantly, I got back on my bike and pedalled away. When the adrenaline wore off, I realized I've got a nice scrape on my right shin, and what feels like it's going to be a corker of a bruise - and it also occurred to me that this was the second time in my life that I've been hit by an idiot in a Caddilac. (The first time being when, as a youth I was chasing my escaped dog when I guy in a Cadillac hit me)
Superman has Kryptonite. Green Lantern has the color Yellow. With me, apparently, it's Caddilacs.