imagining TF2 Spy accidentally cussing in the wrong merc's language when he realizes he's about to die. like he sees that he's about to step on a bunch of sticky bombs, and in a bad Medic imitation, he deadpans "Scheisse." (KABOOM)
Or like he goes to put a sapper on a sentry and the Engineer points the shotgun in his face, and in a sort of Sniper tone he says, "(terrible fake Australian accent) Bugger." (BLAM)