"Boo! I bet I scared you, huh? Scared you in your own haunted house!"
"Nope..guess how many people have already tried the same thing you just did?"
One time a customer grabbed my ankle, he was hiding under an item but he was laying in several inches of slimey brown mud, flat on his back.
"Oh?" (not startled or scared in the least)
"Your Mother is going to be very upset when she sees the mud all over your new sweater."
"Oh, she won't mind." (Yah! Sure!)
They stopped here after their weekend of skiing, slightly over-dressed to be laying in mud.
The couple of times I reacted somewhat in a way the customer could inturpit as me being afraid, I was afraid that the clumbsie idiot was going to fall on me! I had no fear from his actual supposid fear-inspiring act.
I mean really...I own the house, we live in it, I have done all the work here, well 98%of it, I and my wife have had actual supernatural experiences here , is some kid going to scare me?
I spent years working in dark basements by myself.