Folks, be careful of how you CCW, okay? Think through the combination of weapon, the condition in which it is carried, the type of holster, and where the holster is worn.
It is important to understand, at least in a rudimentary fashion, the lockwork and the various safety mechanisms on your weapon and how they operate. Is your firearm normally cocked? More accurately, is there enough energy stored in the ignition system when it is in its normally carried configuration to detonate a primer? If yes, what type of mechanical safeties are on your firearm? How do they operate?
For instance, many inexpensive striker-fired arms have safeties that only block the trigger from being pulled and do not block the sear (the piece that holds the striker back) from moving. A sufficiently hard jolt to one of those, combined with worn parts of softer metal, could bounce the striker off the sear causing a discharge. Even if the safety is of the sear-blocking type, how easy is it to inadvertently disengage? Just in case it is disengaged, is the trigger covered in such a way that it cannot be snagged or pulled?
Even if your weapon is normally in an inert condition (ie the lockwork is at rest, without enough stored energy to detonate a primer, such as a Glock, revolver, or double-action pistol,) be aware of the length of trigger travel and the weight of the pull required to set it off. Again, is the trigger covered by a rigid holster of kydex, some other polycarbonate, or thick leather?
The time to think all this stuff through is before you blow a hole in some part of you that you'd rather have kept intact. Remember: Your weapon's primary safety is between your ears.