I think that was the first porn I ever saw (I was like 12 years old).
Really weird that back then, showing someone a disgusting or disturbing video was considered a good prank.
That era of Internet history was wild. Between weird sex stuff like that and tentacle soup, weird body stuff like goatse and tubgirl, and straight up death like two guys one hammer. It seemed like every third person on the internet was trying to trick you into watching one of those.
Tub Girl is just a picture, not a video. I guess you mean Two Girls, One Cup? Thankfully I managed to avoid that one. Someone tricked me into clicking a Tub Girl link on IRC 20 years ago by saying it was something completely different.
It's a badly beaten female, naked, and upside down in a bathtub, with a solid stream of diarrhea going from her butt to her face. That's what I remember anyways. Like I said, I only saw it for about half a second until I could look away and close my browser, but it was disturbing.