Rob a bank on a school campus, why not? School no weapons are allowed and the one or two security/police are eating donuts.
http://www.ktnv.com/Global/story.asp?S=12913547
http://www.ktnv.com/Global/story.asp?S=12913547
Ah, the "I have a gun" note. Classic. One time some dude robbeed EVERY bank in my hometown with this exact trick.