You work for Big Bad Evil Guy. You don’t really do anything evil yourself; you’re just the security guard in a hallway. What? Everybody’s got to eat.
Tonight you’re working an extra shift. Somebody needed to swap. Two shifts, back-to-back. You’re a little tired, and your mind is wandering.
There are rumors going around that a ninja clan your boss angered is coming for revenge tonight. If so, they’ll have to go right through the hallways you’re guarding. In the process, they’ll have to go through you.
Rumors like that start all the time, though. Nothing ever comes of them.
You’re three days to retirement.