I remembered one of mine yesterday. We were all sent on a "customer service" course once. Fuck knows why as we were an IT department but I think someone had answered the phone to one of the directors rather disrespectfully.
Anyway, we arrived at breakfast time and were staying overnight. As the rooms weren't ready, we checked in and left our bags at reception which were taken up to our rooms by the hotel staff. At the end of the first day we had to report back to reception to collect our keys and I got to the front of the queue.
Without any prompting from me, the receptionist said "Ah Mr Savage, you're in room 16. Here's your key". I was amazed that she'd remembered me from 10hours previously so said "That's incredible. We're here on a customer service course and you've remembered my name from 8am this morning. That's incredible customer service. How did you do that?" She smiled and said "It's on the name tag on your jacket lapel".
Everyone just pissed themselves laughing and I kept a low profile the rest of the night.