Spongebob Squarepants - Saxophone?
In the Spongebob Squarepants episode called "Band Geeks," Squidward is leading the band in their practice. He plays a series of notes on his clarinet, then asks each of the instrument families to repeat what he just played. When he asks the brass section to play, one of the characters is playing a saxophone...which is a woodwind instrument, not a brass instrument. Guess only a "Band Geek" would notice...
Episode "Band Geeks"