We are all cursed with "surprises" at work. We come in, sit down, get ready for the day. We select a task to start on and about half way through, it explodes on us. The seemingly simple task now has 30 subtasks all lined up, ready to destroy our day.This is stressful. Since we're likely already overloaded, this new surprise just adds more work to the day and delay to our backlog.However, if we've limited our work-in-progress we look at these "cans of worms" a little differently. They still might be annoying, but they aren't quite so stressful. We understand that, like it or not, the amount of work necessary to get this task done has increased and we can adjust. The slack we've created in our schedule and our work by limiting WIP allows us to adjust gracefully (you can still gripe, it's okay) and plow through the extra work.