Kasa-Obake

Origin
Kasa-Obake are a mythical ghost or yōkai in Japanese folklore. They are sometimes, but not always, considered a tsukumogami that old umbrellas turn into.

It was collected in the early 20th century as Warehouse 12 agents first explored the Japanese continent. It's identity as the Kasa-Obake yōkai was confirmed several decades later.

Effects
When opened on a rainy night the umbrella will pull itself from the hand of its owner and dangle just out of reach in front of them. It will move jerkily away if it is reached for. In the likely event that its owner flees in terror it will drop to the ground and remain inert until it is picked up, closed and re-opened.

During collection is was "tag-teamed" by the agents involved, one managing to grab it from behind as it taunted the activator. This caused it to spasm wildly until it pulled itself free, whereupon it closed itself and fell inert. This was hypothesized to be a sort of sulking behavior.

Given that legends of Kasa-Obake date back hundreds of years it is currently unknown is the artifact is unusually durable or just one in a long line of similar acting artifacts. The rumored existence of similar artifacts in the Yūreigasa and Kasa-Ehime supports the latter theory.