Was it a Varndean School coach? Our car broke down on the way to the ground and had to hitch a lift on the motorway. Got a lift from Jamie Baker, the then Argus journalist, but had to find a way back home. I went round the coach park to find a coach that would take me home and got a lift from the Varndean coach.When as a group of schoolkids we booked a coach (with Plumpton coaches) to go to the City Ground to watch us in a League Cup quarter final at the then European Champions. We organised it ourselves, collected the money and had a good, well organised trip without any adult involvement. We filled the coach and all skivved off and so far as I can recall there were no repercussions!
Ironically, the Seagull Special train broke down on the way and those fans never made it.
As for games I shouldn't have gone to. I went to the Leicester match at Withdean the day after we moved into our house. I left Mrs Gwylan cleaning and tidying things away. It wasn't as if I was gone all day - I was out for about three hours but she was still talking about it many years later.