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/
I think it's funny that Dethklok is both a parody metal band and one of the best metal bands around. I don't even really like metal and I love Dethklok.