Title text:
Wait, what do you mean, 'dark matter'? It's not dark, it interacts with high-energy gamma rays ... right? Oh jeez, did I forget to make it interact?
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3263/
"Fuck. I meant to make more of them..."
"well you know i figured y'all would fill it out eventually"