Anointing of the sick
The Anointing of the Sick sacrament is done by a priest.  The priest brings oil, which he has blessed.  Usually, the oil is olive oil or another pure plant oil.  The priest rubs the blessed oil on the patient's forehead, and sometimes other parts of the body.  While he does this, he says special prayers that are meant for the Anointing of the Sick sacrament.