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:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3232/


In T2: Judgement Day, when Miles Dyson has to turn two keys simultaneously to open the vault to get the Terminator prototypes, they go
3-2-1-turn and then AFTER that, they turn. How many times would people have messed that up, learning such a weird pattern? That’s totally unintuitive!
Judge it yourself