I like to mess with people. "It's 80% done so there's only 80% left to go". "Now' it's 90% done so there's only 90% left to go" etc. Of course my current project is rather higher stakes than usual, so I'm being a little bit more sober than I normally would be. However I am emphasising the need for communication with other stakeholders and identifying and trying to rectify where they are bottlenecks pdq.