If you thought it was your own room why would you have knocked? You would have just opened or attempted to open it
That’s my answer.
I don’t care if it’s the right one that’s what would have made me suspicious
A woman was in her hotel room, looking at memes, when she hears a knock on her door. When she opens it, a man she has never seen before is there. "Oh, I'm sorry, I thought this was my room." said the man. He left. The woman immediately called security. What made the woman so suspicious? This one's real easy