A long time ago I was on SIA from SFO to HK. I don't sleep well on planes and after the long flight with lots of drinks I arrived in HK. When I reached the taxi stand I realized I had cleared customs without my luggage. Tried to enter the terminal through the exit but no luck. After pleading with several representatives I was finally reunited with my luggage.
We arrived in HK picked up our luggage and went to get on the airport express. I asked my husband to put something into the front of the suitcase and when he unzipped the pocket realized it wasn't his. He has traveler for years with the same suitcase which had plenty of tags that we clearly didnt look at. Turned right around to return it. The rightful owner at first pretty displeased realized soon enough it was an honest mistake. Was reunited with ours as well which had been left at the carousel.