I was watching stand up comedy on television the other night and something hit me. The comic was waving the mic all around and using the mic at all distances from his mouth. The thing that caught me off guard was that there wasn't much difference in sound as he did this. Which leads me to believe that maybe he had a wireless lav, and that the SM58 in his hand could have been just a prop? I don't know if anybody here has ever done this kind of thing, but it did pique my interest nonetheless.