Slight copy-pasting from the "most viewed lost videos" thread, since this is a memory of mine I always been interested in revisiting.
Around 2008 - early 2010s there was a toy commercial or demonstration that, from what I remember, got decently popular on youtube for using Justice's D.A.N.C.E. as background music, a then-popular electronic song. It's how I discovered the song growing up and from what I remember of the comments, many others discovered the song from said commercial as well.
The toy was some sort of dancing blue monster from what I remember, targeted to young kids. I don't think it was meant to be "educational" like similar dancing toys, but it was probably meant to encourage kids to get up and move. The commercial was decently long, using up a good amount of time to showcase the toy's features, which from what I remember, was mostly just dancing.
The commercial was up for a decent amount of time, I remember even checking it out one day years after initially seeing it. However, as time passes and my memory of this commercial fades, the more difficult it is to find. Combined with the fact it's a toy that's most likely not being sold anymore and possibly wasn't even that popular of a toy outside of it's youtube demonstration makes finding this commercial/demonstration rather difficult.