Taking a "sick day" as a teacher is more trouble than it's worth sometimes.  As if the time put in to planning for a substitute teacher isn't bad enough, the report from the teacher and/or students when you return is sometimes worse.  Pour yourself a drink and join Minke and Molina for singing, laughing, and sharing all things related to our experiences with being absent from school.  In fact, why don't you call in sick to have a listen ;)