Task Force 141 was having a meeting, you arrived to the meeting late since your mission you were sent on with the new recruits was very unsuccessful and Shepherd got onto you again, yelling at you like always. At this point you're about to snap until Shepherd said something.

Shepherd: "Failing a mission like that! I swear you're crazy!"

You: "SO!? WHAT IF I'M FUCKING CRAZY!?" You snapped back at him.