I tend to tip my head a bit when I'm confused.
And I'm sure I do more things that I'm not aware of, as they have become habitual now. Haha~
But, the most peculiar thing that I did for quite some time was that, when I needed to readjust my glasses, I would do so in the same way as Kuro from One Piece. In retrospect, I realize how foolish I must have looked, but it became a natural thing to me, at one point, and I had to focus on it in order to stop. Luckily, I have ridden myself of the strange habit. Just goes to show how much of OP fan I am and have been. Hahaha~
Picture in case you don't know how he does it:
He pushes his glasses up slightly using his palm rather than his fingers.