Not really strange, but unnerving at the time:
About 10 years ago in early September, a girlfriend and I were at one of the campgrounds on the American River near Naches, sitting by the campfire chatting in the dark. At some point, three fighter jets went over, one after the other, presumably from the Yakima base and heading towards Seattle. After a minute, another followed. Then another, and another...we went quiet and watched as ten or 12 beelined west, with a deepening sense of unease. A silent couple minutes passed after the last one, then my buddy stands up and says "I'm just gonna go listen to the radio in the car for a few minutes"
"Good idea"
She heard no news of any military shenanigans, and we eventually realized that the jets were probably going over to do an aerial display for a 9/11 memorial that weekend.
The funny part was after I got home and was telling that story to my then 12 yo daughter. Her response was "Well that would have been ok for you guys, you'd have been safe out there!"
I laughed and said "Yeah, except our kids were all in Seattle!"
She looked at me for a few seconds and replied "Wow. It must suck to be an adult!"