That gives you the "Mario Jump"-sound effect when outside of the SAB.
Please Anet give us a hide Chest Armour-option. Tattoo-clad Norns everywhere beg of you.
Still waiting for SAB trinkets for just this thing.
While we have the bauble infusions, I wouldn't mind one that has the jumping sound effects, and maybe sound effects for when you're walking/running unless they'd be too annoying