Digital Submissions
While I was at university, my department at one point switched from requiring students to hand in physical copies of assignments to digital submissions. Apparently a few people on another course had some problems with the procedure on deadline day, so the department sent us a note round saying that to cover for that, anyone who submitted incorrectly on deadline day would have their individual deadline extended by 12 hours.
Cue a load of students deliberately submitting unfinished assignments incorrectly so they could get the extra time.
Story credit: Reddit / JFVarlet