An unstable morph matrix

A giant beer bottle!

"Holy cow! This worked perfectly!" Walter's voice came from it as he saw his reflection in the full length mirror on the wall.

Suddenly it started to glow again and once there stood...

"Ugh! Holy sh-" - just then his voice was cut up by another transformation. And now there stood...

A naked Hannah!

"Finally! That was weird! Crap, the transformation matrix must be unstable! Hopefully this didn't affect the laser-based geographic-spectrum stabilizer, or else I may appear anywhere else - as everything else!" she mumbled when suddenly...