I really want to say this video was uploaded by Machinima though my memory of this is a bit hazy.
There was this animated short that started with a really disturbing looking 3d animated woman/girl leaving her house. I do remember her humming a tune with her just going, "Budum bum bum..." The whole animation is bright which can make it seem like a children's animation. A part I remember well was her going to check on her neighbor and the scene just cuts to a box on a couch with a poorly drawn smiley face.
This animation I want to say was around 2009 though it appears to have been wiped from YouTube. Regarding the title I do believe it was Machinima that uploaded this but looking at the channel archives I feel it doesn't fit the channels style of content. Has anybody else seen this video it was 100% real as even my dad can recall it though he truly believes it's lost forever.
After speaking to my dad about this video he mentioned the title went along the lines of, "Happy Morning" or, "Happy Day" something along those lines as the girl was in a good mood. He too cannot recall the creator of the animation and couldn't find the video. If anybody knows of this video please let me know this video was weird but it meant a lot to me.