I went into the man's room

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I met a new friend yesterday. I accompanied with her to withdraw some money from the bank. On our way back, she wanted to go to the lady's room, so I followed her. When I went in, I felt it was very different, so I asked her whether it is the lady's room, she said she had no idea. When we went out, we met a guy right in front of the door, what would that guy think?