This line comes from the SpongeBob SquarePants episode Band Geeks, first aired in 2001, where Squidward tries to form a marching band and Patrick Star asks whether mayonnaise is an instrument. The exchange became a lasting internet meme because the question is so confidently wrong, and short clips of the line spread across YouTube, TikTok and meme pages. Creators still reuse it to punctuate silly questions, failed performances and moments of innocent confusion, keeping this cartoon joke instantly recognisable to new audiences.