my sixth sense would be super fast reaction times, like seeing things in slow motion and being able to dodge bullets. its more like an ability or super power, but still, it would be awesome!
you believe in ghosts beause your unconscious tells you to. There is no conscious grounding in your belief - it was useful at some point in your life and the unconscious reinforced it from then on, without heed to whatever damage it can do to you in the future. You simply can't base logical effects on an illogical cause, or lead logical causes to illogical effects.
If they did, my sense would automatically be to communicate to a ghost. <3ghosts