The Department of Homeland Security's "See Something, Say Something" campaign is giving out free promotional mouse pads at NFL games that urge attendees to watch their fellow Americans for "unusual behavior."

Most recently handed out at a Baltimore Ravens game, the mouse pads, developed by Securetransit.org, ask football fans to keep their "good eye open" and report any alleged suspicious activity.

According to the website's "What to look for" section, an assortment of mundane activities, including everything from wearing vests, jackets and "disproportionate" clothing in hot weather to parking a vehicle with improper tags, are deemed not only suspicious, but worthy of law enforcement intervention.

"Early recognition and reporting of potential terrorist activities is the first line of defense against attacks," the website states. "Be aware of what is going on around you. Whether traveling, at work or at home, be on the look out for suspicious activities."