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“I’ve Seen Enough Hentai To Know Where This Is Going” is a catchphrase often used in image macros to suggest that tentacle rape is imminent. The original images typically have some sort of creature with tentacle-like appendages.
The phrase was inspired by the tentacle rape trope, shokushu goukan (触手強姦) in Japanese, often seen in a type of Japanese cartoon pornography known as “hentai” (Japanese for “pervert”). The first known use of the phrase “I’ve seen enough hentai to know where this is going” comes from an animated GIF made from a scene where Batman is battling Poison Ivy in the show Batman according to Google image search. The image was posted frequently in June and July of 2011.
The first Reddit thread using the catchphrase was posted on July 9th, 2011. There are 2 Facebook pages for the phrase with 13 and 8 likes each as of July 25th, 2011.
Derivatives can be found on FunnyJunk, Memebase, Very Demotivational, and Tumblr.