Here's some:
I won't ride unless I have a rubber band or hair band around my left hand-grip. Not sure how I picked that one up. Right now, it's an 0-ring.
I think I might have picked it up from when I had long hair, come to think of it.
Whenever I get a new vehicle (or "new to me") I spray WD-40 on the linkage of the carb or injectors. I told someone once that it was "magic spray."
I avoid minivans. But I think that's more just common sense.
I will ride in heavy rain, or dry weather (but not light rain) - but again, probably common sense.
I never wash my bike. I only wipe it down. My fear is that if I wash it, it will break.
Holy shit, I am more fucked up than I thought.
BUT - still alive, LOL.
My dad's pre-flight was just the normal. I picked up some stuff from that - like making sure the throttle doesn't stick, making sure the controls all work, etc. . . Those are more along the lines of ritual.