What do you guys think is the most disturbing scene in Breaking Bad?

There are a lot of disturbing scenes in BreBa, but some that I have found that are the most disturbing are the ones where Gus's face gets blown off as well as the one where Leonel recognizes Walter and starts crawling towards him. However, I do find the most disturbing scene to be the one where Heisenberg's machine gun is empty and yet it's still turning after all the Nazis are dead. Something about the atmosphere in that scene is just so eerie to me. But what do you guys think?