I love that on the prison breakout level:

• I was detected by enemies while couching behind the closed doors of moving prison elevator.
• While in the furious shootout between inmates and corrections officers in the prison cafeteria, I was detected because I tried climbing on the trashcan near the door (but failed somehow), which got me shot at.  I was in complete darkness... in a room full of loud gunfire.
• I was immediately detected if I attacked an inmate in the cafeteria, even when in complete darkness.
• Inmates will stop in the middle of the cafeteria shootout in order to investigate any major, minor, or IMAGINARY sound I might make.  They pull a flashlight and slowly search their surroundings.