That’s my recollection, I have no idea how much of it is accurate. In my head it’s Simpsons, Homer has brought some tangrams to some event because he misunderstood what he was supposed to actually bring, and Lisa is the one who gets upset. But if it’s from Futurama, I’d accept that, or Family Guy, or a completely different show, or something I just made up out of whole cloth. Help!
Right off the bat, “you idiot” (or “you eediot”), was a Ren and Stimpy catchphrase.
Also, there’s a line in the simpsons where someone says “that’s a right triangle you idiot”, but the context is different.
“No, I want roast beef, YOU CLOD!”
I forget the context or episode but from Simpsons, directed at Homer: “You Idiot! Those are Colorforms, not chloroform!”
Edit: was he supposed to be drugging Apu?
Season 11, ep. 7 (“Eight Misbehavin’”):
Even better than I remembered.
That’s it, thank you!