Ancient Top Mid Smoke from T Spawn 2
TechniqueJumpthrow + W
Semi-instant House smoke from spawn 2 (front-left). During freezetime aim at a dot on the rock as shown. When the round starts, move forward, to the left and backwards to get in to the rock corner. Hold shift, tap W and jumpthrow (or use jumpthrow+forward keybind). This is essentially the same nade as this one, except you pre-aim from a specific spawn for much faster execution.
See instant House smokes from other spawns: