There is a lovely (and cautionary) tale about a bloke who developed an automatic gripper for a robot. Like the one here, it had a microphone that listened for the article to slip.
When it was finished, late one night, he wondered what it felt like (well, you would wouldn't you) and put his hand in. Luckily, he was able to reach a crescent wrench and dismantle the gripper.
His mistake of course, was to tell the other blokes about it. Then again, it is a cautionary tale and it might have saved someone else from having a worse experience.
Jim