Calvin Johnson
During a game against the Chicago Bears, Calvin Johnson the receiver on the Detroit Lions jumped up in the air and caught a would-be touchdown pass in the end zone, landed with both feet in bounds, took a couple of steps backward, and slid on the ground with his left hip before sliding out of the back of the end zone. It was clear to most that possession was established, well not everyone because officials said otherwise. They claimed that he lost possession after he let go of the ball to celebrate his touchdown. Plays like this are now commonly referred to as the Calvin Johnson Rule, stating that a player must keep possession during the full process.
Deion Sanders
Deion Sanders was a college athlete at the time studying at Florida State University when the NCAA realized he was not attending his classes. This was against the student-athlete regulation policy, which states students participating in sports must keep up a certain GPA and attend all classes. After this, the NCAA made sure to implement stricter eligibility criteria.