I was flying to Indianapolis on January 4, 1971 (age 15) on an Allegheny Airlines CV-580 - N5820. The aircraft had experienced a landing gear problem at the previous stop (Terre Haute, IN) but continued on to IND. When the gear was lowered, it was clear there was a problem.
The pilot performed two very low fly-bys down runway 22, while fire and rescue personnel tried to verbally inspect the gear. When they could not determine the status, he made one more fly-by over the tower (full-flaps, gear-down, nose high). It was scary AND thrilling.
We landed and the right main gear collapsed. At about 3,500 feet down the runway, the right wing contacted the ground and we made a VERY rapid 270-degree spin to the right. We ended up face the runway at a right angle.
Our spin in the wet grass caused a few outbursts, but there were no serious injuries.
One interesting bit of trivia: Three weeks earlier, another Allegheny CV-580 had a gear-collapse on the same runway (N5828).
I have also experienced numerous aborted landings - including a DL-1011 that aborted in Atlanta AFTER the main gear contacted the runway. What a thrill!