Young Sheldon recently solved a decades-old Big Bang Theory mystery

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But Young Sheldon did not like it. In Season 7, Episode 4, "Ants on a Log and a Cheating

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Winker", 13-year-old Sheldon and his mother Mary return from their summer in

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Heidelberg – a stint in Germany that Big Bang previously told us was Sheldon.

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but that's neither here nor there... In the tag scene, Sheldon returns home from

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his college dorm, knocks on his parents' bedroom door only once, then opens the

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door to find his parents having sex.

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Mary had surprised George Sr. with a sexy Oktoberfest getup – including a blonde, pigtailed wig – and when Sheldon arrived, Mr. and Mrs. Cooper were engaged in role-play.

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