Grammar Girl has an interesting perspective on the Word Crimes video. http://www.quickanddirtytips.com/education/grammar/weird-als-word-crimes-video

Perhaps it would be okay to use with really advanced students, but I think I understand where she is coming from in that it can be insulting to those who don't properly use grammar. I'd rather a student try to speak (or write) and mess up, than not to do so in fear of being wrong. And this video really just highlights lots of ways to be wrong.