I think this thread can be summed up in two words: "Shit happens."
OT: In relation to gaming: when you're playing a stealth game/section of a game, someone will ALWAYS be waiting to walk around the corner JUST as you leave your safe spot. You can wait 10 minutes to make sure no guards are near but it doesn't matter. A pertinent example of this is in TF2, playing the Spy, hiding invisibly with Cloak and Dagger, waiting to backstab - "Nobody's walked by here in a while, may as well uncloak... *Pyro runs out and burns you in 2 seconds*".