What would you have done????? please answer everyone who can?

my mate told me a story about a gay man he knew that went on holiday and went into a dark room, he fumbled around and eventually found someone who he thought was 'nice'. only to discover it was his ................ dad! no joke! they were apparently mortified as neither knew the other was there and also neither knew the other was gay. when they got back off their holdidays the sons mother asked the father why he had not been round for a while, my friend told me the son couldnt face his father what would you do? lol