2 incidents.

Mine - Incredibly long trip from India to RDU. AI flight got cancelled in Delhi for fog, had to stay at a crappy hotel; then wrestle with AI to ensure they rebooked us on the flight from JFK to RDU, got to JFK at 9pm, and go to get boarding pass for last flight to RDU and realize AI had not confirmed my son's ticket...the AA agent took pity on us and managed to get us on the flight (never flying AI again but that's for a different thread). Anyway get into RDU at past 11pm, tired/jet lagged - point out my suitcases to hubby who pulls them off the belt and we go home. I collapse in bed, exhausted. Next day, go to unpack suitcases, and cant figure out for 5 mins why the key is not fitting the lock. That's when I realize - I had pointed out the wrong suitcase to be grabbed. Ughs. Back to the airport, and hand in the suitcase, and collect ours which was being held at unclaimed baggage. Hopefully the poor folks who suitcase I grabbed got it back...

Next one - not my, but the sibling - works in the UK; has 2 passports because he has to travel a lot, and there is one country he travels to that won't give him a visa if it shows he has visited a rival country. So one passport has his Indian visa that he needs to take with him when he goes to India. We meet up in London, go to his flat, spend some time relaxing, then take a cab to the airport. I check in - everything goes fine. Then he checks in, and the agent is thumbing through his passport looking for the indian visa. Yup - you got it right. In his infinite wisdom, he had grabbed the wrong passport. NO time to go back, get the passport AND board the flight. So I go ahead, he goes back home gets his passport, comes back, gets put on standby for the next flight to Dubai, and luckily because of his status, manages to get on it. I have not let him forget that.