Actually, it depends on who you do it to. Do it on most Sinkies, yes. Do it on Conqueror and that big guy in white, you are asking for trouble.
Conqueror is NOT afraid of such things like ghosts. I will normally engage in a combat instead. He did it for his gf. I will do it for my pride and anger.
No matter how you look at it, it is still about CONFIDENCE. Confidence is prime.