Depends on where you live. In the city more often because of congestion and parallel parking is common.

I've had both of my bikes tipped over just this past year. One instance on a street where I was gone for all 10 minutes grabbing a coffee, the other was in a designated parking spot (bike parked in the middle, ~30 deg angle for max visibility and space hogging.)

At night, avoid areas where bars / clubs are located because of drunk revelers. Don't purposely fit between tight parallel parked cars. Attempt to avoid parking behind high height cars (trucks, jeeps).

Still, you can be as careful as possible, and it can still happen when you're out and about doing errands.

It's enraging especially since I haven't come across anyone who leaves a note, but simply commits a hit and run. I know they know they hit it because they stood the bike back up.