In high school my friend and I were doing a make-up quiz and copied off each other so we could finish at the same time. The teacher caught us because we were not slick at all.
Also in HS my friend and I were taking AP Psych and the HW came in these large ass packets, so we usually did half and gave the other one our half to fill in. One day she screwed me over and so we photocopied the assignment and turned it in anyway

The marks back were hilarious actually!
Those are the only instances and I never cheated during college.