Become the boss and take extra long vacations.
Or excuse of Short jail time.
or spiritual journey deep into the mountains.
or rehab for your amphetamine addiction that only happened because you wanted to work so hard at your job.
some bitch at my work uses period pain like all the time
plus my boss is a chick so shes always like "oh yeah honey i know"
I have one that is fail proof, but can only be used once. I have done it at every part time job I ever held.
Call up your boss before your shift starts and tell him you can't come in. Tell him how your grandma's cat jumped on the stove while the burner was on and the cat caught on fire. Now you need to take the cat to the animal hospital. Trust me it works, because your boss will think what the fuck did he just say to me? And you'll be fine because no one would be sick enough to make up an elaborate excuse like that to miss a night at Mcdonald's.
Another one I have is if you want to miss work for a couple weeks. This depends on if you use your arms at all at work. Get a sling and tell your boss you have a dislocated shoulder and can't use it for two weeks.... Another is if you have had a seperated shoulder and never got the surgery, you will still have that odd looking shoulder. Tell your boss you seperated shoulder and will be in a sling for 6 weeks. Since your shoulder lookes fucked up, you won't have a problem.