Smiling Guards Puzzle

Two guards were on duty outside a barracks. One faced up the road to watch for anyone approaching from the North. The other looked down the road to see if anyone approached from the South. Suddenly one of them said to the other, “Why are you smiling?”

How did he know his companion was smiling?

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SherlockHolmes Expert Asked on 19th December 2017 in Easy puzzles.
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    Best answer

    The guards were standing face-to-face, looking at opposite directions. So, they could see each other’s face.

    Viji_Pinarayi Expert Answered on 21st December 2017.
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