True story: In 1970 some
political anti-war radical decided to break into a draft board office in
Delaware. However the interior door that opened to the draft board office was
always locked and attempts to pick the lock failed.
Several hours before the
burglary was to take place, one of the radical wrote a note and tacked it to
the door: "Please don't lock this door tonight."
When they came back later
that night, someone had obediently left the door unlocked. The burglars entered
the office with ease, stole the Selective Service records, and left. They were
so pleased with themselves that one of them proposed leaving a thank-you note
on the door.