One of my brothers has this weird habit of always blinking his eyes even when he does not need to. This is one of the habits that he has picked up from our grandfather. He does this often, especially when he is feeling a bit stressed or when he is thinking more often about the things that he has to do.
My other brother has this weird habit of nail-biting which explains why his nails are not really in the best condition right now. Actually, when you take a look at his nails, you will notice that they are a bit small. The appearance of his nails can make his fingers look a bit weird.