My triggers:
-a turning a door knob from the other side if I don't know who is there
-red vinyl upholstery
-any sound that surprises me if I don't recognize it immediately
-the smell of air-dried clothes
-callused or dirty hands or feet
-animal feces
-the smell of cow's blood
-anything that sounds like a mouse trap
-the sound of a leather belt
-the sound of cocking a shotgun
-creaking wooden floors
-anything that smells old, unused, or stored
-long narrow stair wells
-antique glass door knobs
-body odor with hints of - dust, oil, sweat, gasoline fumes, grease
-bike chains
-the sound of small animals crying in pain
-anyone behind me even if I know who they are and why they are there
-splattered blood
-the most horrific one is the sight of a hook & eye lock
-etc, etc, etc...
I guess I'm just a wreck.