[General Discussion] Those little touches in games that make you say wow (Or possibly Guild Wars)

A recent one (I think this applies) was when I learned the significance of being kindly asked to do something in Bioshock. I mean, it makes sense but at the same time, you'd never think of it meaning anything more then
just "Go pick up that Pipe wrench".

Spoiler:

You are "Kindly" asked to do several things throughout the game, which seem fairly benign: Pick up a weapon, open a door, go complete this objective, small stuff... but as it turns out, it was a trigger phrase which the character could NOT disobey, and in order to progress in the game You had to kindly perform what the other guy requested!

Jam it back in, in the dark.