When I lived in a, erm, more eventful part of Philadelphia, three kittens popped out of my neighbor's shed. We kept one, brought another into the office, and th

When I lived in a, erm, more eventful part of Philadelphia, three kittens popped out of my neighbor's shed. We kept one, brought another into the office, and the third one was too wild for us to manage. We've since moved, but when we lived there, we did trap and release for dozens of cats. The one kitten we kept has distinctive fear reactions to sirens and gunshot type sounds (we live next to 95 and deliberately backfiring your exhaust is, for some reason, a popular choice) in ways that our other cats don't. It's noticeable enough that we've joked about it being epigenetic.