Narbacular Drop
Rare5.7%ObjectiveOptionalMulti-player
Co-operative
Place a portal under your co-op partner while they are gesturing
Drop a portal directly under your co-op partner while they're mid-gesture. Get your partner to stand on a portalable floor and start a taunt (they're locked in the animation and can't move), then place a portal under their feet so they fall through. Easiest done by agreement. Named after Narbacular Drop, the student game that became Portal.