I was called off a bus to the aircraft for a connection flight in Germany, because the gate staff had let me through onto a flight that had a similar flight number but was 2 hours earlier than the one I was supposed to be on (my fault, but I jumped off one aircraft half-asleep, to see what I thought was my next one boarding...)
They swapped my ticket so I could stay on that flight, which was a result because it was about £100 more expensive than the one I had booked! Thanks Lufthansa!