Count von Count first appeared on Sesame Street in 1972, a friendly vampire puppet obsessed with counting anything in sight. Performed originally by Jerry Nelson, the character parodied classic Dracula figures while teaching numbers to children. His habit of laughing ah ah ah after each count, often with thunder and lightning, became his signature. The laugh later spread online as a reaction sound for counting jokes, list videos and edits that need an instantly recognisable, nostalgic punchline for numbers.