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/
This is why you have a practice count! “On three, everybody… one, two, three!”
“Okay, got that? Here we go: one, two… three!”