SCP-999 comes from the SCP Foundation, the long running collaborative fiction project where writers document fictional anomalies in a deadpan containment format. Unlike most entries, this orange gelatinous creature is described as completely friendly, playful and eager to comfort sad or scared people, earning it the nickname the Tickle Monster. That contrast made it a fan favourite and a staple of the scp 999 meme in fan art, games and animations. Its happy gurgles sum up the character perfectly, so creators reuse them whenever they need innocence dropped into horror.