Brett has an intense, irrational fear of needles and other sharp objects. brett is most likely to be diagnosed with:

Brett has an intense, irrational fear of needles and other sharp objects. Brett might be diagnosed with phobic disorder.  Phobic disorders (phobias) involve steady, unreasonable fears and avoidance of the situations or objects that motivate these fears. They are the most common form of anxiety. 

You will hear a hissing sound because of the carbon dioxide escaping the can or bottle