It's amazing how easy it is to put an unauthorized commercial together: and how willing corporations, if not embracing them outright, turn a blind eye to what you do, as long as you don't really trash their product.
In the mid-90's, I operated a website called the Church of SPAM. The good people at Hormel® never bothered me because I only sang praises of SPAM®, while trouncing rival, ripoff product Treet®. At the same time they were shutting down other sites that used their name inappropriately, I was left alone.
For the last year, I've had a video on YouTube that concerns Burger King.