A few things, some of which I probably shouldn't admit to.
The 'probing Uranus' easter egg in ME2, the 'witty' banter between Cole and Baird in GOW, and not so much in a game, but during an online match, the temper tantrum my former lecturer threw when he was unceremoniously killed and proceeded to rant about gaming conspiracies, lag time, BT internet, and us being a bunch of f#cking c@nts because we were all 'cheating' and conspiring against him. And I was his teammate.