I was preparing some gear for my role in assisting on a course for newbie photographers and I set my DSLR to output through its HDMI so we could demonstrate the impact of various settings on the big screen in real time - a really powerful teaching aid.
When I turned the lens to look at the 60in screen on which I was displaying I got the following images and had a bit of a flashback to my youth and my first encounter with the slightly psychedelic opening sequences of Dr Who! Next I will get nervous when I see a toilet plunger on a garbage bin...