I've told this story before...

Some years ago I was hanging Christmas lights on my front porch one night. Had my S&W 915 in a holster on my hip, but pretty much concealed given the heavy clothing due to it being in December and at night. I thought I heard the leaves in the front yard, under a tree, rustle. I stared into the inky blackness, but couldn’t see anything given it was dark out there, and the porch light pretty much robbed me of my night vision. I chalked it up to wind and continued hanging the lights. Then I heard the rustle of leaves again. Turning, I saw nothing, but my spidy senses were tingling so I reached down and popped the safety off my firearm in a deliberate manner as to make it as loud and obvious as possible. Then the person who was standing under the tree watching me from the darkness made a hasty retreat out of my yard.