Those persons randomized to the catastrophizing group will undergo a 10min pain catastrophizing induction following the 25 min post- IV catheterization rest period (we are also calling this the stress experiment). The PI will guide participants to focus on their pain, to imagine it worsening in the near future, and to describe how their worsening pain will affect life domains most important to them. The induction is standardized in the following ways: 1) duration of induction (10 minutes); 2) imaginal focus on pain worsening in the near future; 3) participants are guided to describe the anticipated negative consequences of their pain worsening; 4) participants will be guided to describe the ways in which they feel helpless while imagining the scenario. Items 2-4 are designed to tap the 3 components of pain catastrophizing (rumination, magnification of pain, helplessness).