I still remember the riddle on the cliff in Beyond Zork: My tines be long, My tines be short, My tines end ere my first report. What am I?

I got stuck on the game because I couldn't answer it. Spent months and then years thinking about it. Then one day the answer came to me, but by then we didn't have a Commodore 64 anymore.

Then in the 90s they rereleased the games as part of Return To Zork. I eagerly raced back to the cliff to proudly intone my answer! A portal was revealed, and I ran inside to claim my reward...and was promptly killed by a giant slug.

Good times! Btw, I'm sure many people on this list could reply with the answer to this riddle. I would invite you not to, to give others an opportunity to noodle on it if they wish.