I actually had permission to use it, but not in this way.
I admitted to my husband that I got tired of plucking the fine, thin hairs between my eyebrows and I wanted to borrow his mustache trimmer to remove them. (Eventually, even fine, thin hair thickens and turns dark.)
He said, “Okay.”
But I found another use for it!
My winter coat, see http://wp.me/pKNzn-nG, is white and washable. It didn’t survive the holidays without a spot, or two, and I decided it was time to wash it.
I was disappointed when I took it out of the washer and noticed black pills along the edge of the sleeves. It made the coat still look dirty. I borrowed David’s mustache trimmer, again, and trimmed those little pills off. The trimmer is safer to use than a regular razor blade.

The little, black pills were trimmed off of the sleeve on the left. They are still visible on the sleeve on the right.