File:SG-Tripwire.jpg

Summary
From http://www.sodahead.com/united-states/will-colombia-university-hire-the-boston-bomber/question-3641677/?link=ibaf&q=terrorist%2Bbomber&imgurl=pjmedia.com%2Ftatler%2Ffiles%2F2012%2F09%2FBill-Ayers-stomps-flag.jpg