Probably yourself echoing through your own headset. Happened to me so to test this I started singing(yes,it needed to be distinguishable) and I heard myself singing through the headset.
English
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No, definately not: I even held my breath to listen.
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Well that's creepy...
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Exactly :/
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Maybe it was your mother in the next room breathing heavily from sexual exhaustion.
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That WOULD be creepy: I'm 37. Was about 35 at the time, married, children... Plus my father has been dead for almost 20 years now. Nah, I think we can rule her out. Also, I was the only one at home.
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Well if COD taught me anything, it would be that apparently a lot of people other than my dad had sex with my mother.
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Hahaha that's true. Various animals, even.