Haha, grin fucking. Same thing happens in academic settings when students make up an excuse about their granny's death. I'm going to use this whenever students come up to me and tell me a sob story about doing better on the next test. I'm gonna say "Jonny, don't grin fuck me".
unfortunately, if they're not lying and simply trying to be even keeled despite the circumstances, then you'll be the asshole instructor with an unpleasant paranoia about being grinfucked.
(next time please use something less emotionally loaded such as "a dog eating their textbook" as your placeholder example)
Trust me on this. It's really easy to tell which students are willing to work and learn the material in order to pass and which students just want to lie their way through.
(I used grannies because that's what happens in the trenches. Nobody complains about dogs any more, thanks to technology and iTech almost everything these days is electronic so the excuse threshold is a bit higher. Anything short of death or serious bodily harm doesn't cut it anymore.)
