The problem here is that whilst it's long been accepted that you can't joke about having a bomb in your bags when checking in, we have novel real-time services such as Twitter, and the authorities and general population at large have to work out what the middle ground is.<p>Personally, I think the man's a fool, but can understand why the authorities investigated him. Otherwise, what's the alternative? Make a joke about bombing a place and so avoid being searched when you turn up there?