Label the box not so you know what is in the box, but so you know that the thing which you are looking for is not in the box.

I voluntarily shunned rubber gloves to allow the slight sting of the baby Portugese Man O'war that were attached to the longline that I was pulling up from the Cocos Island Marine Reserve to spice up my hands, and love sweeping  my palms gently through nettles.