Lotsa bears around here and I've had them in both the back yard & front yard and it's fairly common for them to wander down the road, but so far nobody has had any physical encounters with one.
A couple months back though, we drove into town about 4:00 in the afternoon and got home 90 minutes later to find that a bear had come up the driveway and tore the downspout off the side of the house and actually ripped it in half.
I've seen chipmonks go into the trough, supposedly to get the water, and I'm guessing perhaps the bear saw him go in there and was trying to get him.
Nobody was home when it happened, but it coulda been nasty if someone came walking around the corner of the house just as it was going on.
Here's a couple pics I took.