Why Didn't Someone Think of This Sooner?!?

While shopping at Wal-mart yesterday, I saw these diapers:

 Like most kids, mine have, at times, rebelled against laying down to get a diaper changed and I have had to change diapers while the child was standing up.  WHY DIDN'T ANYONE THINK OF THESE DIAPERS EARLIER?!?!?  What a great idea for the wriggly little one who can't be bothered with laying down for a few minutes to get his or her diaper changed! 

What is a product you wish someone would invent to make a mom's job a little easier?