Biotônico Fontoura is a Brazilian tonic whose memorable advertising jingle has circulated for decades through television commercials, making the brand name instantly recognisable across Brazil. Online, short clips of the jingle are reused as a nostalgic sound effect, especially in memes and videos that play on strength, energy and retro Brazilian pop culture. Its short length and catchy delivery make it easy to drop into edits, which is why it continues to appear in new content long after its original commercials aired.