Was wondering if anyone has had their bike engage a gear as you were starting it.
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Not exactly. I had something similar happen on my C10. I completed a valve adjustment on the bike. I started it and backed out the garage. The bike was in neutral all the time. I grabbed the brake and clutch as I normally do and as I put the bike in gear it suddenly lurched forward and my right hand lost its grip on the brake. The next thing I knew the bike had hit the garage door frame and me and the bike were on the ground.
The only thing I can figure was the clutch didn't want to let go when I squeezed it. Ever since then I always work the clutch and brake a couple of times before I start the bike.