Here’s a clip from last night’s Nightly Show, where Larry Wilmore welcomes head writer and contributor Robin Thede to give a quick lesson in Black Lady Sign Language. Thede covers some of the most basic gestures like the single hand clap, double hand clap on syllables, and double hand wave pullback. Familiarizing yourself with these gestures will not only help you better understand black women’s non-verbal communication, but as Thede points out, it could even save your life.