Black letter on black background - not the easiest thing to read

I saw these signs for a yardsale yesterday on Lazy Lane. On the door (or whatever it is), they wrote "yard sale" in black lettering on a blackish background. They were too lazy to fix it I guess. But not too lazy enough to haul a big heavy door down to the corner to use as a sign. I don't understand people. I bought nothing at that sale.