Particularly when so many stores don't want to accept 'dirty, dangerous' paper currency in the check-out. Yesterday, I had to dig out my bank card three times, and went home with a dozen twenties in my wallet. If this happens again, I'll re-deposit the cash and just get with the trend.
On the subject of this planet - I worked with an old Greek gentleman, who pointed out that the name is of Greek origin, and it's pronounced "Our-an-os", not 'Ur-anus', or 'Urin-ous'. So, no need for off-color jokes.