['You cannot believe, what I just did. I wanted to surprise my friend at his new house, but I was at the wrong his. So instead, I surprised a complete stranger.', "That's so funny! How did they react when you did that?", 'They were surprised, I apologized and exited the house as fast as I can. My face was red.']
I would've been so embarrassed if that was me. At least you've got a funny story to tell people.
I was visiting the new house house of a friend. I wanted to surprise him so I did not knock on the door. So I entered the house, but it was the wrong house. So I yelled Surprise !  to a complete stranger in his house. I apologized to him.