Admiring the long winding driveway leading up to Mark's house, it suddenly dawns on you that the garage door is open.

Hmmm, looks like the trash men have already been here... no...today is Sunday...they don't work on Sunday. What was he saying about putting a botched experiment in the garage? Uh Oh ...I better go tell Mark about this.

Suddenly a gust of wind shuts the door to the utility room behind you

BANG!

Ahh rats...well maybe I can jiggle this doorknob and get back in.
Wiggling the knob up and down you hear a soft click