You know how it sometimes is when you walk out of your house. You need your keys, your phone, your purse or wallet, and your briefcase or bag. It's so easy to forget the little things - for example, your entire outfit for the day!
We can only assume that this man didn't have the time to work out what would and wouldn't be safe to be scanned, and so he's taken all his clothes off for the purposes of efficiency. We wish we had this much body confidence. Nice pants!