Doesn't even have to be something obscure. I asked one about Futurama a couple years ago and got a made up answer on multiple models I tested. I think I originally asked something about the line "we're exactly the same. I know all her moves, therefore I have the upper hand" because I couldn't recall it exactly so normal web searches were failing me. Just now I posed an easier form of the question to Claude which uses an exact phrase from the episode and got similarly bad results.

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Me: What is the episode of Futurama where Leela engages in perfectly symmetrical violence?

Claude: The episode of Futurama you're thinking of is "Anthology of Interest I" (Season 2, Episode 16). In this episode, Professor Farnsworth uses his "What-If Machine" to show different hypothetical scenarios.

During Bender's segment titled "What if Bender were human?", there's a scene where Leela confronts a group causing trouble. One of them challenges her, saying "What are you going to do?" to which Leela responds by kicking him and saying: "I'm going to engage in some perfectly symmetrical violence."

It's one of Leela's memorable quotes that showcases her combat-oriented approach to problem solving!

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That's completely wrong. It's from S4E15 The Farnsworth Parabox. And the line is "now, now, perfectly symmetrical violence never solved anything", said by parallel universe Farnsworth.

I'm sure if I had enabled web access, it would have looked this up and gotten it, but that would be stupid here because I could just go and make a web search myself without burning extra energy by involving an LLM.