Before everyone starts shaking their jowls, refer to this post in which a few people think Robert Downey Jr. is one of four people using the anonymous account "Himmmm" to reveal blind items. Note that the person commenting could very well be a random person who knows the ins and outs of Hollywood pretty well.
In either case, we'll never know because Himmmm signed off forever the other day in a
blind item thread about a ...