Frightening Dentist’s Chair

Origin
No one likes going to the dentist, which is why this dentist's chair has absorbed the feelings of frightened children, pained candy-addicts, and irritated surly folk to make it highly dangerous to interact with.

Effects
Sitting on the chair itself immobilizes the person and wracks them with pain (though it's usually only psychological), while just being near the chair creates intense feelings of dread and panic.