Kurt Vonnegut, Jr. said that using colons meant that the writer had been to college. Heck, I think a father should teach his son how to use a colon: it's a father's job not the job of college to teach sons about the effective use of colons. Of course, the college graduate can, like me, overuse the colon because he likes them so much: in which case such person might need a colonoscopy.