I don't see what's so scarring about having a hot teacher who cosplays as a maid.
Less the image, as more the delayed realization that she looked exactly like the Bloodhound of Valencia. Nevermind that with two years difference since I last had class with her, memories can get quite malleable with things that are as perfectly compatible with the image.
It just happened. Completely out of the blue and the shock was less about her as much as it was about me making that connection. Don't tell me you've never been surprised by where your mind can go on its own? Just apply that and go into overdrive and it's what I experienced.
I'll NEVER get that idea out of my mind. It's burned straight into my consciousness.