Does anyone else do this? My beginning warrior is exploring and comes across a civilization that happens to have a worker on their border. My warrior dashes in and kidnaps the Worker. Now I can have a settler and worker very early in the time it would take to build one or the other. I just run the worker back to my empire. If he happens to die on the way by barbarians at least I slowed the start of an opponent. If it's not too far my Warrior will escort the worker back.
It seems to be the "standard" thing to do at higher levels! My exploring warrior steals 3 workers from 3 civs in an immortal (level)/immortal (Persian UU) game.