Title text:
They're up there with coral islands, lightning, and caterpillars turning into butterflies.
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3135/
It's not like anyone makes you take a quiz to go wander around outside.
I knew it! I am so not answering any more of his questions, next time I go out.