Fight Club, by Chuck Palahniuk (1996). Page 47:
“Two screens into my demo to Microsoft, I taste blood and have to start swallowing. My boss doesn’t know the material, but he won’t let me run the demo with a black eye and half my face swollen from the stitches inside my cheek. The stitches have come loose, and I can feel them with my tongue against the inside of my cheek. Picture snarled fishing line on the beach. I can picture them as the black stitches on a dog after it’s been fixed, and I keep swallowing blood. My boss is making the presentation from my script, and I’m running the laptop projector so I’m off to one side of the room, in the dark.
“More of my lips are sticky with blood as I try to lick the blood off, and when the lights come up, I will turn to consultants Ellen and Walter and Norbert and Linda from Microsoft and say, thank you for coming, my mouth shining with blood and blood climbing the cracks between my teeth.
“You can swallow about a pint of blood before you’re sick.
“Before the presentation, Walter from Microsoft smiles his steam shovel jaw like a marketing tool tanned the color of a barbecued potato chip. Walter with his signet ring shakes my hand, wrapped in his smooth soft hand and says, ‘I’d hate to see what happened to the other guy.’
“The first rule about fight club is you don’t talk about fight club.”