When you're watching Seinfeld, episode "The reverse peephole" and you ask yourself: "The reversers have a peephole? Where!?"

or when there in the airport and see the old rainbow united coclors and wonder where the ngx is

When looking at a cockpit photo on airlines.com you try to pan around with spacebar and mouse or trackir.

.... when you're "communicating" with an imaginery ATC while "taxiing" in the city towards the runway (highway).... when you look around in the driver seat and thinking "wow nice FPS....lets press shift Z twice...."