[ Marty blinks as the text suddenly disappears, only to reappear as something else completely different. Okay, he didn't type anything down, and nobody was around here to prank him, or whatever. His computer just totally typed something out by itself. Now all of a sudden, he feels less smartass-ey and more nervous. What with the thing possessing his computer and everything.

He sits up, moving the laptop down to his bed. ] Okay. So you're tellin' me you're a ghost that possessed my computer so I can help save your sister?

[ Hopefully nobody walks into his room right now. Marty probably looks crazy, talking to his computer. ] Do I look like the Ghostbusters to you? [ A band made up of guys who believed in ghosts. Probably the worst thing you could do, unless you wanted to end your music career early. ] The hell do you want me to do about it?