How to ruin perfect date/sex/relationship with one sentence

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Imagine a situation. You met someone. He is cool, cute, hot, you really like being with him...you think its perfect match and he is your future. And then he said or did something awkward in the worst possible momment. What was it? Share your stories!

I will start. I met a guy, who was really nice to me, he was cool and he was physically my ideal type of guy. Sex was also very good. Very passionate, romantic, but also kinda animalistic. We finished. Kissed. He was still inside me, when he said..."I hope you dont have AIDS". I looked at him with the "what the fuck look". And he kept saying it again and again..."I hope you dont have AIDS. I hope you dont have AIDS. Do you have AIDS? Why arent you answering me? Do you have AIDS". So I only told him "Its a little bit too late for this question, dont you think?" And I told him to go home. Never contacted him again.