Well, this one is a first for me. USC suspended a student for failing to intervene when third parties got involved in his sexual encounter with a fellow student. In other words, the school said that his sex act was consensual, but suspended him because two of his buddies slapped her on the butt. The California court of appeals found that both the evidence and the process were insufficient to justify the punishment.
You can read the full opinion here: http://www.courts.ca.gov/opinions/documents/B262917.PDF