Outside of the office here in Milwaukee, there is a slow and steady rumble off in the distance, much like the rumble of an evening summer storm. Rumor has it that 500,000+ Harleys are in town and boy are they loud.
A co-worker lives five miles from county fairgrounds that are hosting a party. He could step outside the door and hear the rumble. I myself saw 10 or so on my drive over. A few were rolling up sleeping bags in a rest area. The best part; BMW offered congratulations, but thought they couldn't hear it.