Looks like the dude is wearing blackface so his boss fired him.

The paint makes him look like he has blackface which is extremely offensive and often leads to people losing their jobs.

The first prank with the binoculars is an old, classic prank of putting black paint on the eye holes so it makes two circles on the person’s eyes who wears them. So he was one-upping the prank by tricking the guy into looking through a hole that would paint his entire face black.