My eyes, they burn!

My eyes, they burn!  Friend and former colleague Aleck L. sent me the animated GIF at right, showing one dolphin apparently “punching” another.  I knew that dolphins did this to sharks, but I'd never heard of one dolphin doing this to another...

Thinking that this might be a clip from a longer video, I went to YouTube and searched for "dolphin punch" – and was immediately treated to an alarming collection of insanity on video.  Who are this people, and why do they make these videos?  My eyes, they burn!