El Patito Juan is a well-known Spanish-language children's song about a little duck named Juan, long sung in homes and classrooms across Spanish-speaking countries before short clips of it began circulating online. Its simple melody and repeated quacking made it easy to remember and share, and it later found a second life as a meme and short-video sound, where creators reuse the nine-second snippet for cute and comedic edits. That mix of childhood familiarity and playful silliness keeps it popular with both parents and younger audiences.