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Popcorn.gif is an achievement in Halo: Combat Evolved Anniversary that is awarded for killing 100 infection forms in the level Keyes, on Heroic difficulty or above. The achievement is worth 25 Gamerpoints.

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The achievement can be easily unlocked by utilizing the Bandanna skull. At the beginning of the level, a wave of Flood will normally force the player to jump out of the ship and into a pool of coolant. By enabling the Bandanna skull, the player will receive unlimited grenades, which they can then spam at the Flood as they drop through the hole in the ceiling, quickly racking up 100 infection form kills.