You shouldn't lie about having migraines.
Peter has a presentation at work, but he is unprepared for it.
Peter wants to get out of having to present.
Peter asks his friend at work to do the presentation for him.
Peter says that he has a migraine even though he feels fine.
Peter's boss is impressed at the knowledge that Peter's friend has on the topic and congratulates the two.
Peter's boss makes him go to the doctor and bring back a doctor's excuse.