Studies have been done to investigate this phenomenon. Gradual withdrawal of remifentanil seems to be associated with less pain in a rodent population. (4) A recent study by Norwegian colleagues in a human population evaluating two types of pain stimuli seems to confirm this in healthy volunteers. (5) The investigators would like to investigate whether a gradual post-operative withdrawal of remifentanil is indeed associated with less immediate pain compared to after an abrupt withdrawal in surgical patients undergoing minor surgery.