While it may seem like common sense for classroom's to have fire extinguishers in case it were engulfed in flames, many do not. Now here's yet another reason why they should have one: deter potential attackers during a lockdown. Simply have the teacher stand ready at the door and pull the trigger should an attacker barge in. Click here to view the first image in this week's geek life gallery. Continue reading for a viral video of a three-wheeled vehicle you should never see on the road.