I was doing a website for a company just a few weeks ago and me and the manager were browsing the web together and talking over the phone. He said he wanted something changed about the site so i got onto my SFTP and changed it. I asked him what he thought now. He said that he couldnt really see the difference and that I should change it some more. This went on for about 20 mins when I realised that he wasnt refreshing the page!