Anyone remember seeing a video called "Scary pop up" back in the day? I wanna say I saw it in 2009-ish. It was a short 10 second video featuring a GIF of Alvin and the Chipmunks in front of a glittery background, and the face at the end was a photo of Hannibal Lector. You could hear what sounds like sped up humming leading up to the screamer, and the scream was out of sync with the actual pop-up. Very cheaply made stuff put together by some kid.
Anyway, I never thought I would see this video again, but my searching eventually led me to an old prank video where you can see the video in (mostly) its entirety. You can find that here.
Additionally, I also found another reaction video where you can see "Scary pop up" in the related videos. This does confirm the title, but the original uploader's username is too blurry for me to read. You can find that one here at about 25 seconds.
The uploader appears to have a long username with 2 digits at the end. Possibly 99 or 66?