Air Force Thunderbirds
The noise of being front row for a screaming Thunderbird may have tramatized the two year old. Now he says "watch out" everytime there is a plane overhead, but something to temper his fascination with large machinery is probably good.
My dad pointed out that the least terrifying of the stunt planes was a P-51 Mustang, which his dad flew in WWII. That is, until he was shot down over Germany. A good thing as it earned him a ticket to California to sit in a tank pointed at the sea. So there we were, three generations, remembering the fourth from the greatest generation, a memorial day moment.