Make a fist as if you are about to knock on a door. Then air-knock once with your fist. You've just signed "yes" in American Sign Language (ASL). And I could use this sign until my knuckles were raw to praise this volcanic and emotionally draining revival of SPRING AWAKENING brilliantly conceived and directed by [...]
SOURCE: Oscar E. Moore at 11:43AM on October 6, 2015