Tests it on a celebrity of course

John had finally put the finishing touches on his new swapping and amnesia ray gun. The mind control tech that he used to swap any person with an inanimate object had just been configured as was the amnesia mind wipe tech. All of which stored inside the small gun that John concealed in his jacket

He got into his car and drove throughout the streets of Los Angeles, checking all of the celebrity hubs looking for a celeb to test his new invention on.

After a while he had found his sexy test subject, or rather, subjects...

Actresses Hayley Atwell and Elizabeth Olsen were the ones in question. Hayley was wearing a sexy navy figure hugging dress

While Elizabeth sported a black shirt and yoga pants as she had just finished a training session at a private gym for an upcoming movie she was preparing for

John figured he'd use the amnesia function on one of them and the swapping function on the other, allowing him to test both features