Well back about 20 years ago when they decided to shut Jandakot Tower at 6pm on weekdays there was an incident where one aircraft landed on top of another after the tower closed and the people involved were extremely lucky to survive that. I saw it happen.
They had put in a CAGRO, a retired very experienced controller, but he obviously wasn't there as ATC although his voice was familiar; some people thought the tower must be open. One of the pilots apparently insisted he had been "cleared to land" which was obviously not the case, one controller who had finished his shift saw it all unfold as he was leaving. It was a complete mess. But we did get longer tower hours after that.