Worms: Armageddon
Near the beginning of a game on a created map of mine that just featured floating girders over lethal water, I ninja roped my way to a girder occupied by an enemy and cracked him with my baseball bat. He flew majestically through the air before bumping into another enemy, sending him flying too. This happened a couple of times thanks to some mines going off and when the dust settled, a massive 8 of my two opponent's collective worms (5 from one and 3 from another) perished from one baseball bat strike. And I larfed mightily throughout.
CounterStrike
During a LAN session, a friend of mine (let's call him Freddie) had been doing particularly well on a sniper-friendly map. He was in a spot that was open enough to view most of the surface but covered enough to shield him from return fire. And the only way to get there involved a very loud climb up a long and cover-less pipe; certainly loud enough for anyone, including the sniper, to hear. But I grew frustrated with his sniping so I braved the climb. Much to my surprise, no one heard me! So I snuck up to a ledge behind Freddie, aimed my sub-machine gun to the back of his head, and said aloud, "hey [Freddie], look up." He swung his character around and I turned his head into salsa. And I larfed mightily.
Front Mission 4
"You couldn't take an *anthill* without suffering casualties!" I larfed.