Strange, but I have had this recurring dream for many years, even before I "graduated" college. It's commencement day, and I learn in the line to get your diploma that I didn't fulfill all my course requirements, so I didn't really graduate. I go up the steps anyway, and they tell me I didn't graduate, so I have to walk off the platform empty-handed. Bummer.
May have something to do with the fact that I really didn't go to my commencement exercise.