... we [can] catch fish and just throw them back... it [doesn't] seem to hurt the fish much past a cut lip. But then... one [may] swallow the hook...[it'd be] a goner, whether we tried to pull it out or just cut the line. Because once you've swallowed the hook, there's no losing it. Me, I've swallowed it big time. 
Graham McNamee, Acceleration
metaphor