The "Boing Chair" is a fun chair, which releases springs after 15 to 30 seconds, when an avatar sits on it. These bump the avatar in the air. The chair restores itself after a while, depending on the amount you damaged it.
Besides, it is a carefully textured, pretty worn piece of furniture. It comes along with a second, not bumping chair and a single prim couch table, so you can use it in a living room set.
There is a version for humans and a version for tinies available.
Humans:
https://www.xstreetsl.com/modules.php?name=Marketplace&file=item&ItemID=1740930
Tinies:
https://www.xstreetsl.com/modules.php?name=Marketplace&file=item&ItemID=1740878