This is a trick I’ve been doing for years; I have a proper honing steel, but a mug works just as well for most common knives and household scissors that need a quick perk.
Take any mug that has a rough ceramic rim around the base; in the illustrations I’ve used a local coffee mug. In a similar technique as using a honing steel, except that you’ll run the knife on a single surface rather than alternating sides (see video here to understand what I mean). As he points out in the video, make sure you run the knife or scissor blade from the base to the tip, to get even sharpening the entire length of the blade.
Always keep your fingers away from the sharpening surface! Apply just a bit of pressure to get the best effect; a bit of practice will teach better than I can explain it. It usually only takes me 10-15 passes of each blade to get a pair of scissors back in top form, and the same with a knife.
CuppaNatter 