Darry: He will sprint into the room for no reason and kiss your forehead before running out like a crazy man.
Soda: He sticks his tongue out, between his lips while concentrating especially while doing the dishes.
Two-bit: Whenever he laughs, he throws his head back like a little kid.
Ponyboy: Sometimes no reason he pretends he can't move any part of his body and goes dead weight. He then tries to make you drag him around different parts of the house.
Steve: Whenever he's nervous, his body starts to twitch.
Dally: He's like a little kid in the bathtub, he tries to splash you, spit water at you and even plays with bubbles.
Johnny: He has a twitch where he blinks and squeezes his eyes tightly for a couple of seconds. He says he does it because his eyes are cold.