I saw an approach mistake the other day that I've never seen before. We
were flying the VOR-A @ 12N (http://204.108.4.16/d-tpp/0503/05026VA.PDF)
and were a little off course (in good VFR conditions). My student looked
up at about the right time, saw a runway, and went for it. Unfortunately,
it was the wrong airport. 3N5 (http://www.airnav.com/airport/3N5) is all
of 1.5 miles away from 12N, and they both have a single runway of
approximately the same size and orientation (the both even have a lake at
the end of the runway).

Fortunately, he was on the ball enough to notice it had a big "6" painted
on the end instead of a "3". I wonder how many of us would be alert enough
to notice the same thing when we broke out at minimums?