At 10:30 18 November 2005, Don Johnstone wrote:

A short story: When I was a lad I was interested in
all things flying and I was in a control tower at an
airfield in the UK. The circuit (pattern) was full
with about 8-10 aircraft performing 'circuits and bumps'
(It was in the days when the RAF were allowed to fly
their aeroplanes). An aircraft turned finals still
well out and a slightly excited voice said on the radio
[callsign] 'lower your undercarriage' The two aircraft
on very late finals promptly retracted their undercarriage
and landed wheels up, lots of sparks and minor panic
in the control tower.
I am sure the man on the radio meant well but the proper
procedure was to fire off a red very light forcing
a go round.
Just an illustration of how a well intentioned warning
can go wrong. I was 14 at the time, the response of
the fire teams was impressive. No pilot was injured
in the telling of this story.