She suddenly passes out

"THE POSSIBILITIES OF THIS THING IS ENDLESS!" she exclaims. "This could change the world if we even just understand how it works... is it magic or—?"

Just as she was getting excited with the number of things she could try out with the guillotine, she suddenly faints.

"oh my god babe, are you okay?!" you ask.

You then lay her on a couch and put her head under a pillow. Thinking of all the exciting things you could do with the guillotine, an idea suddenly sparks within your head. You wanted to do more experiments, you just couldn't wait.

You then bring the guillotine closer to your passed out girlfriend. You were thinking of a really big swap between the two of you, wondering if switching brains or voices was possible.

You wanted to try it out while she was still asleep, carefully bringing her body near the guillotine, you had to make a decision, were you going to switch brains or voices?