Muggles can appear from anywhere, anytime, anyhow. Three or more at a time is called a Muggle Mob.
Photo: The Age, April 3, 2011
The concern with muggles is that they may discover a Geocache, either accidently or by seeing a Geocacher accessing it, and then possibly destroying it. This is referred to as the Geocache being ‘muggled’.
Often times, especially in urban areas, Geocaches are placed in high-traffic areas where there are a lot of muggles around. While this may add to the thrill in finding a cache it also adds to the risk of it being found. This risk is increased when a Geocacher is accessing and logging the find. Geocachers must take great care to ensure that Geocaches are not muggled.
There are a couple of ways to minimize a Geocache being muggled. The first is by ensuring that the cache is hidden properly. A Geocache that is not properly hidden can be easily found by a muggle simply stumbling upon it. The other way is to be very careful when accessing the cache. Before you make your ‘final approach’ take a look around to make sure that there is no one is nearby. Be discreet!
Muggles may appear from nowhere in no time at all. Muggles in groups of three or more are referred to as a Mob (not to be mistaken with a geocaching flash mob). Muggle mobs are often found at shopping centres, parks & gardens, swimming holes, holiday resorts, conferences, weddings and funerals.
Reference - http://ravenview.com/blog/2007/10/31/what-is-a-muggle/
CACHE NOTE: This cache blends into the natural environment of the forest resort surrounds. Take a short walk from the car park to locate and log. Bring a pen. Mind the muggles. Don't feed the wildlife.