Nope, totes serious. 

There was this one night I almost had a heart attack because instead of breathing I heard sniffling, and I [i]knew[/i] there was no way I could explain it away. At first I thought it was my roommate and vice versa, but when I asked it turned out to be neither of us and I got out of bed and ran into the hall and demanded who was sniffling. Turns out it was a friend of mine in the living room, we had all the doors open so our crappy AC could sorta go down the hall, and sound carried. I could have sworn it was in the room.

Everyone thought I was crazy, and I told them to step off because I was ghost busting.

The breathing I've heard during the day and at night whether or not the door is open or closed, so that's something different.