[kbob]

I'd say, "Congratulations! You're one of today's luck 10,000!", but trigraphs aren't really much fun. Just another reminder that C is old, and computing is even older.

I've used uppercase-only terminals, and I've used ancient C, but not at the same time.

[WalterBright]

Ancient C didn't have trigraphs. My copy of K+R (1978) doesn't mention them.

[kragen]

No, they were a design error introduced by the ANSI committee.