For me it was a near miss in LAS this September.
http://forums.flightinfo.com/showthread.php?t=63140
I was the FO, and the PF. We were cleared onto the runway for takeoff, I applied power and we started to roll. It was about 11pm, dark, and still hot outside. We were very heavy, just a few hundred pounds short of needing a 'bleeds off' takeoff. Just after we started rolling the tower cleared the A/C behind us into position, but they requested another 30 seconds. Tower said "Cactus XXX, cancel takeoff clearance", using
their callsign. It was all very low key, and the cadance and timing made both the Captain and me think he just misspoke for the A/C behind us, and should have said "cancel position and hold". He actually meant us, but didn't correct himself.
Unknown to us, just before we had switched to tower, and Air Canada A320 had landed on the parallel and the tower had cleared him to cross our runway. We hadn't heard that clearance.
There were no more transmissions from the tower.
At about 20 knots below V1 the Captain says "I don't think he's stopping". I look over to see the Air Canada moving closer, then right across our runway. I haul back on the sidestick just as the Captain yelled "Pull, pull, pull!" There was no way we could stop before hitting him, so I knew we had to go over. We were still about 10 - 15 knots under Vr and I expected a tailstrike, but we were lucky. We staggered into the air, and the Captain watched out the front as we passed directly over the Air Canada by 50 - 100 feet.
And the passengers never knew a thing.
HAL