That feeling you get after a class or meeting that you weren't prepared for has been postponed.
You have to look disappointed but feel the epitome of utter glee inside knowing you will have more time to complete (and/or procrastinate) the work.
Teacher: Sorry class, the test will need to be given tomorrow because I've been busy with the divorce and night job and shit.
Student: Aww (Inside they feel true cancellebration)