What Has Been Seen Cannot Be Unseen | Know Your Meme(What Has Been Seen) Cannot Be Unseen is an Internet axiom which states that one literally cannot get rid of the mental image that becomes part of the memory after looking at a disturbing photo or a video. The phrase is commonly used as incredulous reaction to a shock sites or a surprising revelation of anomalies in an unsuspecting image, similar to the usage of the phrase “when you see it, you’ll shat brix.”