Play this game long enough and your day will come. It's inevitable.
The timing on my having caught this thread is incredible. I just had a similar experience. Pulling away from a stop, accelerating at a pretty mild rate, I heard (and felt through the shifter) a loud "bang" as I shifted into second, followed by the loudest "card in the spokes" "braaaap" sound imaginable. I stabbed the clutch in, pulled it into neutral, and did a pretty good verbal imitation of this poor guy. Except in my case, it was not a missed gear, and the motor kept running just fine. And once coasting in neutral, the noise went away...
So, how 'bout third? Let's try it... sounds fine. Fourth? No problem. Fifth? Sounds normal... So I drove home, about 50 miles, by skipping second. This was the Sunday before Christmas. My younger son helped me drop the motor that Tuesday, and I split the tranny off and ran it up to my good friend John Walker. He had it repaired by Thursday, I retrieved it on Monday, and my other son and I had it back together a couple of days later.
Here's what John found:
That's second gear. Broke two teeth clean off. It simply fatigued out, after 50 years. Granted, I'm twisting that poor old 915 harder than Porsche deemed appropriate, so these things can happen. Perhaps this is what happened to poor Jayson, and it wasn't operator error after all.