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Even spinning cranks and running through gears etc straight after lubing can throw enough lube off the chain that some will reach the rotor.
Guess I'll count myself lucky that I've never achieved this. I would have thought the amount would be so minimal as to be burned off pretty quickly too, which aint gonna happen if you've got a leaky piston seal...
Howard-
I guess it depends what lube you use, how much etc.
I can be a bit heavy handed with lube application on the bikes at work (pre cursas so no brakes to be worrying about) and have seen the spray off land on the opposite chain stay in a place where if there was a rotor, it'd have hit it. I guess the Matt finish on the pre cursa maybe shows it up more than other finishes might.
I've also found oily grime on the brake side of my Day One and I know I'm meticulously careful about not spraying anything at that bike and where I'm aiming lube bottles and stuff. It was during winter so I think a combination of slight over lubrication plus drivetrain getting wet had meant that enough was flinging off the chain to get over there.
As for burning off, I don't think there's enough speed or weight involved to burn off much at all.
M_V
Even spinning cranks and running through gears etc straight after lubing can throw enough lube off the chain that some will reach the rotor.