Hey Arnold was a Nickelodeon animated series that ran from 1996 to 2004, following Arnold and his friends in the fictional city of Hillwood. Short, quotable lines from 1990s cartoons like this one have stayed popular because they are instantly recognisable to viewers who grew up with the show, while still working for younger audiences who know the characters from clips and reruns. On soundboards and in short-form videos, the line is now used less as a direct quote and more as a shorthand reaction to someone overlooking something obvious.
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A short Hey Arnold voice clip of the line can't ya read, used as a sarcastic reaction when someone misses something obvious in a video or meme.
The clip is a brief, exasperated spoken line from Hey Arnold, delivered in a sharp, impatient cartoon voice that sounds like someone pointing at a sign and losing patience. It lasts just a few seconds, with the emphasis landing hard on the question, so it feels less like a genuine question and more like a teasing scolding. That tone is what makes it work as a reaction: it instantly frames the person on screen as having overlooked something obvious, and it gives the audience a quick laugh without needing any explanation. Played over a fail or a missed detail, it turns mild confusion into a punchline.