wink with your left and right eye
...
raise one eyebrow
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snap your fingers
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wiggle your ears
,,,
say "red lorry yellow lorry" five times very fast
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hold your breath for 30 seconds
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whistle the Happy Birthday song
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say "Buổi trưa ăn bưởi chua" fast 5x
chua quá
roll your tongue
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hop backwards on one foot
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say "hello" in five languages
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can name three countries in Africa
...