One said to the other, "I'll bet that any minute now some senior is going to walk by, put his face to the window, and ask if we're open."
Sure enough, just a moment later, a curious senior gentleman walked up to the window, looked around and rapped on the glass, then in a loud voice asked, "What are you selling here?"
One of the men replied sarcastically, "We're selling assholes."
Without skipping a beat, the old timer said, "You must be doing well. Only two left!"