T=0.000 s – The dot just below the lower tree branch extending over the middle of the road doesn’t look like much:

T=0.600 s – It’s fluttering, which means I’ve noticed it:

T=1.317 s – Rolling at just under 20 mph:

T=2.117 s – I know exactly what’s going to happen:

T=2.850 s – The camera lens is seven inches above my eye level:

T=2.867 s – The air stream over the fairing begins tilting the leaf:

T=2.883 s – Collision alarm!

T=2.900 s – Perfect alignment:

T=2.917 s – I’m now riding with an oak leaf plastered over my entire face:

I wear big lab-grade splash-resistant goggles over my prescription sunglasses to keep dust out of my eyes: the leaf covers the googles, I can’t see out of my left eye (and, thus, the mirror), and most of my right-eye vision has gone green. Although I managed to not inhale during the impact, the leaf forms a good seal over my nose and mouth.
T=3.683 s – Glancing to the left doesn’t dislodge the leaf:

Did you notice the oncoming car?
T=7.483 s – Four seconds later, I’m off the bridge and past the bushes overhanging the guide rail, so I can finally spare a hand:

The view to the rear, showing the car that’s been trailing 1 second = 25 feet behind me during this entire adventure:

I caught another oak leaf the same way on the rail trail a few weeks earlier at a much lower speed in much less stressful surroundings; I figured that wouldn’t happen again for quite a while.
Ya never know what’s going to happen out there on the road…