Lightning cable USB connector stuck!
I plugged my lightning usb cable into my apple wired keyboard, and after a while tried to remove it.
It was stuck, no matter how I tried to (carefully) pull the cable and hold the keyboard.
After about 30mins trying, I shoved some thin cardboard in between the bottom of the usb connector and the slot in the keyboard, it helped to remove it.
On closer inspection after I had the cable out, I noticed that the indents in the bottom usb connector are deeper than many of the other usb (apple and non-apple) connectors that I have.
A warning to others out there!
iPhone 5, iOS 6