Although lack of blinding may be seen as a potential weakness concerning objectivity of the main outcome, we are intentionally not blinding the study in order to mimic PED practice. Our goal is to determine whether nitrous oxide will benefit the child in terms of reducing pain and/or anxiety during a minor procedure. The method of delivery, however, may be in itself noxious to some children (face mask). Introducing this aspect to the standard arm may unduly increase the FLACC Pain Scale score in this group. Additionally, in the sense that we may be introducing a noxious stimulus without any possibility of benefit seems unethical.