The Weighted Storage Cube comes from Portal, the first-person puzzle game released by Valve in 2007, where players use the cube to hold down buttons and solve test chamber puzzles. The announcement is delivered by GLaDOS, the game's sarcastic artificial intelligence, whose calm voice became one of Portal's most recognisable features. Fans kept quoting and reusing GLaDOS lines long after release, and the cube remains a symbol of the game's clever, darkly funny design, which is why the short clip still appears in gameplay edits and Portal tributes today.