In the Navy, onboard a ship, there is a bell and it will tell you what meal is being served in the galley. I'd been onboard for weeks (maybe months) before I figured out that supper meant dinner. Honestly, I didn't give a shit. The bell rang, and food was in the galley. I was very Pavlovian by then. One day, it just clicked that they were calling 'lunch' "dinner".

And I think those dudes in Alcatraz ate better than we did ...