No photographs...
...but once a computer in the sales office (yep, the same one where the guy swivelled on his chair and kicked the power cable out) sometimes couldn't connect to the PDC - i.e. no network?
The guy had a fan under his desk, and every time I went to look I turned it off, and *hey presto* connection.
Anyway, cut a long story (and investigation) short. On his partition was a calendar pinned on the wall with a drawing pin. The pin had penetrated a Cat5 cable behind the false wall. Turn the fan on, the calendar flapped, wiggled the drawing pin, and somehow shorted out/made noise on the cable at random times.
It took me months to sort that one out.