'X-Com: Enemy Unknown'... Cleared 90% of a crash recovery map and knew I had the lone survivor pinned inside the saucer. So, pulling from my studies of military tactics, I set up a double volley line behind the cover of a short stone wall in front of the ship's single exit.
Code:
...[__-__]
..wwwwwwwwww
...sss sss
...SSS SSS
w=wall
s=crouched soldier
S=standing soldier
Theory: Reaction fire from my soldiers would ensure the kill before the Grey could get off a shot... Which is exactly what happened, sorta.
Practice: The alien stepped out of the doorway to immediate gunfire from my troops. A few of the crouched men uselessly plunked shots into the side of the protective wall. Then, almost to a man, the standing rear ranks placed a round into the head of their kneeling brethren in front of them. Then either paniced and continued firing at the others, or were calmly plasma'd by the big-headed midge before he ducked back into the ship.
Sadly, my last save was from prior to the detecion and fighter scramble, and for some reason the game decided to forgo allowing me a rematch, the bugger.