"Three teenagers accused of killing a 62-year-old father-of-12 in West Rogers Park were playing a game called 'Pick 'em out and knock 'em down' when they videotaped themselves punching him in the face..."

They were caught after they posted the video on Facebook.

Similar attacks — some resulting in death — have previously been reported in Missouri, New Jersey and Decatur. The game also goes by the name “Knockout King,” and experts say it is a grab for attention....

“We know that juveniles don’t think out consequences clearly,” Beth Huebner, an associate professor of criminology at the University of Missouri-St. Louis, told the Associated Press after a 72-year-old Vietnamese immigrant was killed in another “Knock ‘em out” case in St. Louis last year.

“They see something on YouTube and say, ‘I want to get that sort of attention, too.’ They don’t think about the person they’re attacking maybe hitting their head."