My kids' elementary school was on lockdown a couple weeks ago due to a bear that wandered down out of the mountains and was nosing around the neighborhood. It passed by about a block from my house, and was eventually tranked, tagged & trucked.
Kids were cool with it, but as a parent you get a nasty chill when you're at work and get an automated phone call that starts off with "(Your child's) elementary school is currently under lockdown....."