I was just standing in the 'break area' on a college campus.
(by 'break area', I mean "spot with a few tables/chairs/pay copier/vending machines"--it's not a student union or a lounge but people hang out there and relax)
A group of students were LOUDLY talking (joking, but...not super jokey--in that "I wonder if theyr'e serious") way about selling copies of exams.
The Dean walked in to buy a candy bar.
They continued. Dean made eye contact with the loudest/leaders [dean is imposing

]. They continued.
Dean said "Guys, I hope you're joking, you realize this is inappropriate".
They said of COURSE they were joking and gave a few eye roles.
Dean explained the role of the dean, reminded them of the academic honesty policy and explained the difference between 'private' and 'public' spaces.
They were at least sheepish until the dean was out of earshot (when they laughed--but it sounded embarrassed)
I know dean and the dean has an incredible memory for students...none of these folks better need a favor from our department in the rest of their college career.
(They wouldn't be penalized, they'll recover fine. But they've burned their 'goodwill' with the dean so they'll have to prove themselves NOT to be twits to get any extra help)