Sick days at at work have always been a weird get out of jail free card. There are so many occasions where you want to plan ahead and make everyone aware that you need a day off but it backfires. Your boss gets crabby “Well, let me see what I can do and I’ll get back to you.” If you were to go back in time and just call in sick on that same day, suddenly it’s no problem. “Ok, hopefully we’ll see you tomorrow.”