Penny Arcade's On The Rain-slick Precipice of Darkness

Three men are standing on a platform, something like a railway platform, except that where the train cars should be there is a sequence of humming geometric shapes.  They are standing before a massive triangle, and - for some reason they cannot explain - they get the sense that this triangle is angry.

“I don’t know, guys,” says Jim.

“It’s cool, man,” offers one of his compatriots.

“Yeah,” says the other.  “I’m sure it’ll be fine.”