One aborted (jet) takeoff - sucked a bird at ANC once, and a couple of go-arounds, the last on a BA 744 landing at YVR. The driver really botched the (not-so-short) final - we were probably 300 feet over the runway numbers. Let me tell you, full throttle in a 744 with only a reserve fuel load is impressive.

I have, however, had three landings that should have been aborted - broken planes but no broken bones, fortunately - but none on big jets, only on light planes and a YS-11 in Alaska.