Moments ago, I searched for "MMMBop" on Google and watched the music video. I have some distinct memories of watching this music video on VH1, probably, when I was about 10 or 11. The cave bit was the thing I remember most from the video.
Tim walked over and the following conversation ensued:
Tim: I wonder what these kids are doing now.
me: I think they're still making music.
Tim: As Hanson?
Tim: That's good they're still making music. They didn't let puberty dog 'em!
Now he is reading the article on Wikipedia about them.