You’ve got to be a little crazy to take a bunch of teenagers on a field trip – especially overnight and out of town.   But that’s what I did, and – yeah – guilty as charged.   For the second time in my more than 15-year career as a public school teacher, I volunteered along with a group of parents and other teachers to escort my classes of 8th graders to Washington, DC, and surrounding sights. And I never regretted…