I had been looking high and low for my TWSBI 580 Diamond EF pen. I feared it was lost forever. I had been looking for it for the better part of two weeks. Repeated deep scans of my brain revealed nothing. Checking every shirt pocket I owned, every jacket pocket, every desk...everywhere...nothing. I'd looked under the bed, behind the nightstand, the kitchen, the office, you name it. There were only two remaining possibilities. Somebody "borrowed" it (permanently) without my knowing it It was somewhere totally unexpected. Not being able to do much about the former, I focused on the latter to remove all doubt. I spied a the tiny corner of a notebook peeking out from under my sitting chair in the bedroom. I looked under the chair and low and behold...there it was! YAY!! Just thought I'd share.