Pieter Post is the Dutch version of Postman Pat, the British children's animated series about a friendly village postman that first aired in 1981. In the Netherlands the character and his opening theme were localised in Dutch, so the short sung intro became familiar to generations of young viewers. Online, that nostalgia turned the twelve second theme into a meme sound, shared on soundboards and reused in edits where a delivery or cheerful arrival needs an instantly recognisable, wholesome cue for Dutch audiences who remember the show.