Unplesant Surprise

I'm awaken in the middle of the night. Not by a loud noise, but a suttle creaking. A familiar sound to me. Someone was walking down the hallway, towards my room. I'm frozen in fear. Normally, this wouldn't worry people but I live alone. The footsteps got closer and my heart raced faster. Scenarios starting going through my head of different things that could happen. As the doorknob started to turn, I quickly grabbed the gun from my nightstand. Pointed towards the door, the gun was loaded and ready to shoot. The door flung open quickly and out of fear I fired. As I walked over to investigate, I was horrified by what I saw. My best friend laying on the floor, holding balloons and a "Happy Birthday" card, bleeding from the chest.