Built up a bike today from the "junk" pile at work ( I work at a bike shop ) to use as a beater for errand running and extended locking out of my sight. Also Beast of Burden missions like trailering my other bikes.
It's an old (maybe five years old) Jamis Explorer from our rental fleet that fell onto hard times needing a few components and such. I changed the stem angle, bars, tires, and saddle, besides the repairs. I have under 200 bucks in it but it is still fun to ride anytime.