If one morning I walked on top of the water across the Potomac River, the headline that afternoon would read: 'President Can't Swim.'
But I think it's always difficult when a product that you're using and accustomed to changes.
Astronauts have been stuck in low-Earth orbit, boldly going nowhere. American attempts to kick-start a new phase of lunar exploration have stalled amid the realisation that NASA's budget is too small for the job.