The lab appears to be empty.

Brainley (invisible): Ha! I've done it! My cloaking device works! Now to deactivate it to make some finishing touches.

Brainley: ...assuming I can remember where I put it in the first place.

Dean (offscreen): Brainley, are you coming to the department meeting or not?

Brainley: I, uh...can't. I'm invisible.

Dean: You already used that excuse last week!