Momo

Momo Screamers on YouTube Kids' Shows is an event with innocent kids TV episodes of Peppa Pig or Kinder Toy unboxing, and other shows aimed at very young children, being interrupted by "Momo" (The creepypasta meme) with threats she is coming to kill the viewer which traumatises the young viewer.

"Momo" threats/screamers have currently been seen on the following: There may be more, but this is what I have heard so far.
 * Episodes of Peppa Pig
 * Fortnite
 * Kinder Unboxings

MOMO
Often, parents will leave their kids alone to watch episodes of childrens' programs such as Peppa Pig, the episodes themselves will be harmless, luring the child into thinking they're watching the full Peppa Pig episode, however, at some point during the episode, without warning, the episode will cut out to a picture of "Momo" doing one of the following: Other examples include "Momo" being replaced with a Filthy Frank green screen where he instructs the viewer on how to self harm with a knife.
 * Singing with a young girl (Momo's going to kill you, Momo's going to kill you, I won't lie, you're going to die)
 * Screaming
 * "Play hide and seek" and don't tell parents or she'll kill you

One of the reasons this happens, is because it's expected that the parents won't be around when "Momo" pops up.

Link (Example)
NOTE : The following video contains a shocking picture of MOMO INSTANTLY. You have been warned!
 * youtube.com/watch?v=NQh0pBQFbYg (Age Restricted)