Katerina Kittycat is a young feline character from Daniel Tiger's Neighborhood, the animated series for preschool viewers built around the world of Mister Rogers' Neighborhood. Short clips of her expressive, childlike voice have circulated as memes and reaction sounds because they are instantly recognisable and easy to drop into a joke. This particular wail, with its call for a big brother, is shared for its mix of cuteness and exaggerated drama, and it continues to appear in short videos where a creator wants a quick, innocent-sounding cry rather than a harsh or realistic one.