It's not often that I get to feel a sense of pride (however misplaced) over my own stubbornness and rigid mindset, but methinks this compilation video of miserably failed attempts at clearing a single wave of enemies in Splinter Cell: Blacklist on Realistic difficulty using only a stun gun turned out rather nicely. Any sensible person would probably have used various gadgets - not to mention some, eh, actual stealth tactics - while still keeping the whole thing strictly non-lethal, but I restricted myself to the stun gun with its infuriating projectile arc and overall lack of speed. I eventually made it through wave 1-5 (out of 20 in this Horde Mode-inspired side mission) and was thus able to "cash out" and save my progress, but the process required almost 3 hours of laborious trial-and-error. The worst thing about it? I kinda liked it...

I actually witnessed two friends playing that exact mission co-op and stubbornly trying to get to wave 20. Thanks in part to an area in that level where enemies cannot reach you and the tri-rotor they managed to cheese their way to victory in the most blatant and amazing way possible.