If you ever go into the attic space of an old farm house,
get to the top of the creaky stair case,
and look around to decide where to go,
but see a spot in front of you,
between the floor joists,
that appears to have been stepped into before,
and you feel glad that it wasn't you,
but wonder what that dimple,
with the light coming through,
might look like from the other side,
well,
this is what it might look like!
My recommendation: when you go into the attic space and need to walk around, walk only on the rafter joists!

Hi Jay ~ Our electrician had a mishap like this - oops!
Liz
It happens Liz, but fortunately, not yet to me!
It happened to the plasterer in a house i sold. He fell right through and scraped himself up real bad.
Robert - I see holes and/or repairs of previous holes all the time!
I agree with this advice. We had an agent whose client fell through the ceiling and then our agent promptly did the same thing. Ooops!
Barbara - it can get dangerous. I did an inspection once where the seller met me at the door in a wheelchair. He had fallen through the garage ceiling and had broken his back!