When I was playing as the Byzantine Empire in EUIII, the Ottomans somehow managed to start a civil war that completely destroyed their army. After that, I managed to get a contiguous coastline from (modern-day) Libya to just shy of Genoa, in about a century. I had an army of several hundred thousand men, divided into legions of 20,000 each. And then I started to get involved (somehow) in the Low Countries, and ended up conquering a good fifth or so of the Holy Roman Empire before everything started to fall apart. But that was only after I'd slaughtered my way to becoming the all-powerful ruler of the Middle East, Egypt, the Caucasus, the Balkans, most of Italy and north-western Germany. Ahh, good times, good times.
Of course, once everything really did start to fall to pieces I went all-out with the cheats, and with the exception of some of the Electors and a French rump state that was constantly being reduced in size, all of Europe from the Pyrenees to Scandinavia to what is today Belarussia and the Ukraine was united under my banner, along with most of the Mediterranean, Egypt, Ethiopia, the African coast down to Madagascar, Persia up to India and parts of southern Russia. And then the patch was applied and I lost a century and a half of complete and total ass-kickery. Oh well.
Or the way I go about playing the SupCom: Forged Alliance campaign - turtle up like the Galapagos, build (literally) a dozen Monkeylords and go to town.
Or crouching behind the sandbags at the end of the Anichkov Bridge on the Leningrad map of Red Orchestra, sending Mosin-Nagant rounds downrange just to keep up the pressure, and shooting somebody I didn't even see yet in the head from over 100m away.
Or when I was carring around an MG-34 in Lyes Krovy (also Red Orchestra), hip-firing my way to the top of the kill board. Or the time in - I can't recall the map, where I hip-fired an MG-34 and got a clean kill on a prone soldier in the rubble about 70-80m away with my first shot.