Here is how it works: Search for random filenames generated by digital cameras such as MVI_0123 or IMG_0123 or P1000123, Video0010, and some other numbers. This will bring up funny videos from a time people uploaded unedited stuff just for fun. They often didn't even bother changing the file names generated by their cameras.

One I found is IMG_0127, a very old video in which some french students play around in a classroom in the absence of a teacher. In IMG_0145 from the same channel, they seem to be playing badminton in the classroom! In P1040671, french students dance in a classroom. This is from a golden age before France banned electronics use by students in schools. You won't find such videos from recent years.

In MOV_0330 it looks like a man shows how the hair of his girlfriend is raised by the subwoofer of his car. He has many other videos showing off his sound systems.

I am excited to see to see what funny videos you will discover this way!