Alternatively, a depressed mother may be more likely to produce a child who is prone to depression - and to have a low birth weight baby because they may be more likely to smoke and drink during pregnancy.

BBC: NEWS | Health | 'Depression link' to small babies

In my experience, a theater audience that contains a significant number of black people is prone to be more vocal in its response to a show.

WSJ: Theatergoers: Can I Get an Amen? | Sightings by Terry Teachout

No one seems to have a convincing explanation why Britain should be so much more prone to this expensive disease than its European neighbours.

ECONOMIST: Car theft