A few months ago, Delta had a guy who was nabbed in Frankfurt by security. The authorities ended up boarding the aircraft just prior to pushback, and removing the F/O. This, of course, made all of the newspapers.

As it turned out, the F/O in question was totally sober. The subsequent investigation showed that his only offense was giving a hard time to somebody at the security checkpoint. This, of course, didn't get as much media coverage.