We used to play Ultimate Frisbee at lunchtime on the ball fields outside the Everett Boeing Fitness Center. It's north of the main Boeing campus, almost directly below the approach flight path to the main Paine Field runway. We'd often hear the sound of the wake vortexes ripping through the nearby trees about a minute after a large aircraft passed by on it's way to land. At times they'd even affect the flight path of the Frisbee (although probably not as often as was claimed - 'not my fault my throw was incomplete - a vortex got it'
).