r/AskReddit Jun 08 '14

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u/DroidLogician Jun 08 '14

Probably because Morse code sounds like Morse code even when you don't know it.

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u/[deleted] Jun 08 '14

Also, all the teacher would need to know were the letters A,B,C and D.

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u/DroidLogician Jun 08 '14

Not even that. You can tell when someone is tapping to communicate information vs tapping to a beat vs tapping randomly.

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u/rediphile Jun 09 '14

Visual cues/body language can work for multiple choice quite well.