I was watching a program from 4OD via Raspbmc (which works very well) and decided to pull the plug for the evening. I switched hdmi inputs on my tv to watch regular stuff and then pulled the power feed to my Rpi. The lights did not go out!. And the network led kept flickering.
I switched my tv back to the Rpi and it was still working with a perfectly good picture with no power supply.
A miracle ?
No. Power was coming via the powered USB hub. Should this happen ?