Get mad, internet! Chris Myles beat you to the punch.
In addition to being spring-loaded for dramatic effect when the pin is pulled, these also have hacked greeting cards inside, which play Cave Johnson's familiar speech before culminating in an explosion sound.
Portal 2 is the sequel to 2007's Game of the Year and draws from the award-winning formula of innovative gameplay, story, and music that earned the original over 70 industry accolades. Features single and multiplayer co-op modes.