If you’ve ever had your computer suddenly freeze and throw a terrifying pop-up message onto your screen, you know the feeling. One Sioux Falls man learned that lesson the hard way recently, and it ended up being incredibly expensive. Dakota News Now reports that Sioux Falls Police are investigating a pop-up scam that cost a local resident roughly $25,000. According to the report, the man began experiencing what appeared to be computer problems when a pop-up message appeared on his screen. Get our free mobile appBelieving he was doing the right thing, the man called the number.