Two weeks before the release of a major new version of an application I'm working on, the testers finally got round to testing the new functionality (a set of a few features and a new page). They didn't agree with the requirements and got the requirements to change with the product owner.

The product owner now says that these changes "are easy to implement" and "the new requirements are clear" even though the other devs and I all don't understand the change. How would a product owner even know it is easy to implement?

Fun times.