Note: Character is a vampire who in life had been a friend of Xander's. However, when a group of vampires, Jesse among them, attack a nightclub and kidnap the people there, Buffy and friends turn up and fight the vampires off, allowing the people to escape, and in the chaos, Xander catches up with Jesse, who says the above line mockingly to Xander when Xander threatiningly holds a stake against his heart, right before a panic-stricken girl crashes into him from behind, knocking him forward onto Xander's stake and killing him.
"'Why did you yell, 'Cheese'?' And The Man would tell him mockingly, 'Because I felt like it, you stupid machine of poo." Breakfast of Champions (Chapter 16) Kurt VonnegutStephen Fry
The poet as well Builds his monument mockingly; For man will be blotted out, the blithe earth die, the brave sun Die blind, his heart blackening: Yet stones have stood for a thousand years, and pained thoughts found The honey peace in old poems.(John) Robinson Jeffers
"Later he tried to keep a straight face as he mockingly confessed: 'While we were away, I found God.' He rambled on about the Bible before concluding, 'We found God. He was right in our stomachs...'" (The rambling had to do with finding a Bible in every hotel room, "Every hotel has Holy Bibles.")eddie vedder