Flush and Walk Away
This one probably didn't go over too well with the HR team at whatever job Luke used to work. But, if he had the gall to write this resignation, he probably knew exactly what he was getting himself into when he started. Good for you Luke, we hope this resignation note doesn't follow you to your next occupation.
Infiltrating the System
If you really think about it, you have way more power as a worker than your boss does as a manager. They wouldn't notice this. If your boss is in fact a "p****," then you might get away with this label for a lot longer than you'd expect.