SCP-999, often called the Tickle Monster, comes from the SCP Foundation, a collaborative online fiction project about strange objects and creatures held in containment. Unlike most SCPs, it is famously harmless and affectionate, which made it a fan favourite and a popular subject for memes, fan art and short videos. Its cute, non-threatening nature explains why creators keep returning to it for wholesome edits, comic relief and lighthearted takes on a universe that is usually much darker.