So somebody comes up with some inventive new specialized way to carry a gun in situation X. It doesn't matter what the situation is, somebody's come up with some special gear solution for it.
Sometimes it makes sense, such as pistol harnesses designed to be strapped to the outside of cold weather gear in bear country. Sometimes it's of dubious utility, like "car holsters". Sometimes it's downright dangerous, like that holster that straps around your upper arm so that you can carry a pocket pistol upside down, pointed at your brachial artery for no reason that is ever adequately explained.
Regardless of the type of strange carry, if you criticize it on the internet you will inevitably encounter some dude who comes along and explains to you that he has spent dozens of hours running drills and scenarios with video and stopwatches and bunches of different shooters that totally justify his use of this system.
Heck, I've apparently spent fewer hours at the range in all of 2013 than some of these guys have perfecting their technique of drawing left-handed against left-handed carjackers approaching from the passenger side rear, and that's even if my range time total includes the hours I spent sleeping on the Crimson Trace bus at the Midnight 3 Gun match because I went out to walk the stages on media night and couldn't find a ride back to the hotel.
(Apparently I should have had a special "Sleeping On The Bus" holster to do that, so I was doing it wrong anyway.)