Damaged my first bit of property today. Tradding a window, and was just wiping the frames when it popped open, swinging inward & knocked a pot off the sill. Luckily managed to grab it before it swept another couple off. Was 100% sure it was closed when I did it, so had a look through the window next to it & saw that the handle had come off the frame. When I mentioned it to the owner, turns out he'd changed the handle, but the new one didn't fit so had left it in place, but not screwed in! My little bit of pressure on the window was enough to pop the latch. Remembered to take some photos of the offending handle, which shows it in the "locked/closed" position, but half hanging off the frame - just in case. People shouldn't leave their 150 year old family heirlooms on window ledges!