We want them to be skilled grammarians and wordsmiths and write bright and engaging headlines and must know Quark. But, often, when push comes to shove, we will let every single one of those requirements slide except the last one, because you have to know that in order to push the button at the appointed time.

Hank Glamann

The co-founder of American Copy Editors Society made this observation about ads for copy editor positions at American newspapers. Quark is the eponymous publishing software of Quark.

Mercurial

mer·cu·ri·al
adjective

  1. (of a person) subject to sudden or unpredictable changes in mood or mind: his mercurial temperament.

    • (of a person) spritely; lively

I recently had someone describe me as mercurial. I think he was right.