Anyone else left an exam early and had to sign the early leaving form?

I just did the FM exam, and it turns out I don't know anything. As such, I didn't want to sit there staring at a screen for ages when I wasn't going to come up with the answers out of thin air. I asked invigilator to leave, and he said fine must you must sign this form. I was like, sure whatever I just want to leave now and not wait 1hr 30 doing nothing for everyone else to finish. Anyone else done this?