Mine must be losing my car keys inside the chamber of Newgrange on the morning of the Winter Solsice. The guides were very helpful and allowed me back in after they had locked up before the tours started, though I'm not sure they really believed me. They were in such a good mood after the great show that morning and had let us fire off some photos, I'm sure they thought I wanted to get some more. After getting an intimate feel inside the cracks in the bowl of the rear chamber we gave up. When I got back to the car after searching the road I saw to my horror the keys were in the ignition. The alarm fob had broken off and I carried it seperate so even though the keys were inside the car was safely locked. I was in such a hurry to get up to get a look inside after the lucky few had been in to view the solstice that I left them behind!