If watching your nightly news doesn't scare you enough, here's a website that warns you of terrorism events and other suspicious activities around the world (the page automatically refreshes the list every 7 minutes or so!)
Link: Global Incident Map - Thanks Johnny Cat!
Update 9/22/07: Here's the global emergency and disaster map - Thanks Another Jake!
http://hisz.rsoe.hu/alertmap/index.php?smp=&lang=eng