We had a good one today. I was tour guiding at the Roque, and for some reason the mobile phone tower wasn’t working, which was a pity because two of my group were driving round and round the observatory trying to find me. They managed to call Ana Garcia, who was trying to work out where the heck they were from their verbal descriptions. Eventually they described the impassible barrier in minute detail, and the penny dropped. They were at the Izaña observatory on Tenerife.
The ravens agreed that this was a rather silly mistake to make, but mostly they were too busy ripping the box of cat food open to get at the biscuits they wanted rather than making do with the biscuits on the top.