xkcd #3232: Countdown Standard
Title text:
Anyone who is caught counting 'three ... two ... one ... zero ... GO!' will be punished with a lifetime of eating only ISO standard food samples.
Transcript:
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Source: https://xkcd.com/3232/
I think you need a fourth word for better timing. A person might misinterpret the duration between glarp and dook, and arrive at peow too early or late. Just one more timing sample is better to reduce human error.