To celebrate the 5th anniversary of XCOM: Enemy Unknown's North American release (we Brits got it on October 12th, 2012) Firaxis Games has paid the game... an unusual tribute. The developer's twitch channel is currently running a video on a loop which revolves around an oft-repeated and equally often dismissed piece of advice, which any XCOM player will have heard many times before.
"Commander. You may want to instruct your men to exercise restraint when using explosives."
Good luck with that. The video may be a little repetition-heavy for some, so if you're time-poor then skip ahead to around 4:45 when things really kick off.