I find cinemas much more interesting than supermarkets as you tend to get a good mixture of power, network, fire and HVAC wiring, as well as plenty of pipes and ducts and ponder over while you wait in the queue.I get in trouble for looking at the steel conduit and tray work in supermarkets...if I started looking at my neighbours earthing arrangements every time I popped in for a bowl of sugar I think I'd be up for divorce!
I recently went to France for a week's break and when examining my camera on my return I found a couple of shots of 'interesting' wiring that I don't even remember looking at. Heaven forbid I ever get to see the inside of a power station!