That's not exactly how you put it now is it?
Loosely translated, I think this is what you meant, "What are you an idiot? You stand in the seat and grab the handles and shrug....Jesus."
First of all, I've never seen a shoulder press machine that held enough weight to do shrugs. Secondly, standing in it's seat would look, well, ridiculous. Why even go to the trouble when you can use dbs?