What can I say? I smelled my hand the other day and came up with this first line and thought I would give it to the world as a writing prompt. You can write it down word for word and write from there. You can rephrase it (change the POV or tone or something) and go from there. You can sit here and think about the scenario (brainstorm, like in your head or with words) and come up with your own first line from those thoughts.

First line:

The back of my hand smells like wood smoke, but I don’t know why.