The line comes from The Disastrous Life of Saiki K, the comedy manga by Shuichi Aso that became an anime in 2016, following psychic teenager Kusuo Saiki and his oblivious classmate Riki Nendo. Nendo's blunt lack of social awareness is a running gag, which is why this mundane bathroom question became a repeatable joke online. Sped up edits later spread on short video platforms and soundboards, isolating the phrase from its scene so creators could drop it into unrelated edits as a recognisable anime meme.