Happiness is diving on your anchor and finding it actually plow down in a sand patch (and not eel grass)!

--- Many years ago, we chartered in the Bahamas. We anchored one afternoon in a protected bay next to some famous red-n-white striped lighthouse. We backed down on the anchor/waited 10 minutes and all was well. Then, we dinghied to shore and climbed the stairs of the lighthouse. A few minutes later, one of my fellow sailors pointed down at the mooring field and made the fateful statement: "Look at the idiot driving his boat through the mooring field". Upon closer observation, there was no one at the helm of the boat and the boat looked "very familiar". Twenty minutes and more than that many apologies later, we remedied the situation. We were subsequently informed about the eel grass throughout the anchorage.
-- Some charters boats have anchors with smaller cleats on the reverse side of the anchor. This allows you to still "catch something" if the anchor hits on a rock and flips upside before finally resting on the subterranean terra firma beneath you. It can also give you a false sense of security in anchoring. This is made worse in eel grass where the anchor won't dig in well.
-- Since then, we dive (scuba if we have it) every anchorage. A plow set deep in the sand with about 30' of chain stretched out on the ground towards the boat (scope of 4 to 5:1) makes for the quote: "that boat ain't going no where!"