Remember the 10-in-1 USB charger monstrosity?
Nokia 2mm barrel, 4mm barrel, Sony Ericsson's line of exposed pins, Apple/Samsung tablet 30pin amalgamation, all three pre-Android Samsung mobile connectors, MiniUSB, MicroUSB and the PSP barrel jack. Then you have another connector for an HP PDA whose USB cable carries data but not power, and then a friend comes with their iPhone and needs charging.
USB-C and EU's decision to unite the ports should have come in 2010 at the latest.