i tap my fingers against things and whistle constantly, I grind/tap my teeth together constantly (to music usually, and more often/as a substitute for finger tapping and whistling), i talk to myself, i am paranoid about losing things from my pockets, i always put my phone in right pocket, and keys + wallet in left, i crack my fingers regularly, and if i ever get a piece of paper that has a diagram or something i will colour it in with pen, like filling in holes of letters, (a's, b's , o's etc) and if it has 2 lines spaced very thinly i will draw a line between those lines, filling it in. My math book is full of pencil lines due to their tables having double lines for their rows and columns, and my chem and physics books have diagrams coloured in. I do a lot of other random stuff, but i cant recall it at the moment and none of it is really habitual.