Cakeman (3:50)
Crypt TV Wiki; IMDb; Sofia Garza-Barba; YouTube

A young girl is eating her birthday cake after her party, and her dad thinks it's too late in the evening for that. Meanwhile, her mom cleans up, and finds a present they'd missed, but it turns out to be empty. Until the girl takes it up to her room, and... finds horror inside the box. I don't want to say exactly what form the horror takes, but... it's both frightening and kind of absurd. In fact everything about the film is a bit weird, like even the non-horrific bits are like a campy parody of a 1950s family sitcom, or something. Which is cool.