I had a coworker who, in planning poker, every time someone said "We just need to..." switch the number he originally picked for the next higher one. Very effec

I had a coworker who, in planning poker, every time someone said "We just need to..." switch the number he originally picked for the next higher one. Very effective way to get people to actually think about what could go wrong. And no, the people who know 100% what the story was, hardly ever said "We just need to...", even before that.