SpongeBob SquarePants premiered on Nickelodeon in 1999, created by Stephen Hillenburg, and its expressive faces and voices became a constant source of reaction images online. The vine boom name comes from the short-form Vine era, when a deep trailer-style hit was reused as a universal punchline for shock and disbelief. Editors later paired that hit with Spongebob moments on TikTok and YouTube, where the contrast between a kids cartoon and an oversized dramatic sting made clips easy to remix, caption and share as a reaction.