Many times, during my COBOL days,
I would have lots of debug code to catch the dreaded 'fallthrough' due to misplaced .'s.
The amount of times I had programs that would print (sorry, DISPLAY...) "THIS LINE OF CODE CAN'T POSSIBLY EXECUTE"...
What the heck - I still like the fact that one lump of data can be overlaid by different PICTUREs.
Two out of three people wonder where the other one is.