I have a great get out for you.
When you got back of holiday and first tried to start the car, were you just trying to start it, or were you about to drive off somewhere?
See, thinking about it, when I get in to drive off, I press the clutch and give the gear stick a wobble. No reason why, just habit. (Maybe there was a reason, but long forgotten in to habit.) But, if I were just starting the car to see if it will start, or what ever, often I dont even sit in the seat, I just lean in, wobble the gear stick and turn the key. Point being, different routine or habit depending on my intention.
Maybe that is kind of what happened to you.
Good face saving excuse?