You know how when you're doing laundry and socks mysteriously disappear somewhere during the process of washing or drying? Well there is a similar tribulation while hanging clothes on the line.

No, the socks don't disappear; the clothespins do!

Hanging an item on the line and for whatever reason the clothespin snaps off the item and the line while disappearing into oblivion! I look obsessively until I finally give up - it's just a clothespin!