Been flying on and off for around 20 years, but frequently for the last 5.
Two GAs during that time, both with BA: one at Glasgow in a 757 low visibility due to the aircraft in front not clearing the runway in time; and one at LHR on a 747 from Buenos Aires where there was an indication the gear wasn't down. Pretty calm reactions amongst the pax, although I imagine an indication of a gear problem might raise blood pressure a bit on the flightdeck ?
And one rejected take-off at Dallas on an American 767. According to the pilot a warning light indicating a tyre problem came on during the take-off roll. We did a lap of the taxiways and took off next time around - but on landing at LGW there was rather more swerving around on touchdown than usual, and the fire services came out to meet us. So maybe the warning light didn't lie...
13Alpha