The 'I Seent It' meme originates from the 2008 stoner comedy 'Pineapple Express,' featuring actor Craig Robinson as the character Matheson. During a tense interrogation scene, Matheson insists on his presence at a crime by exclaiming 'I seent it!' with a hilariously intense and wide-eyed facial expression. The clip quickly became a reaction staple on platforms like Tumblr and Reddit, used to jokingly validate a suspicious claim or to confirm witnessing something bizarre. It serves as the ultimate 'receipt' in internet arguments, often applied to niche sightings, glitches, or unbelievable personal anecdotes.