At the old job I recently retired from, I worked mostly alone in a huge building.
Occasionally my boss would come looking for me -
or as I put it, tried to scare the crap outta me.
Usually I could hear someone enter the building because of the quiet atmosphere.
But when I was working on something that made noise as I did it,
that's when the boss loved to walk up behind and yell my name,
so that he could laugh when I jumped.
After a while, I plotted my revenge.
The first time I crept up behind him and lightly touched the nape of his neck.
He yelled and was not happy.
I laughed.
The second time, some weeks before I retired, I got right up behind him and whispered his name in his ear.
He screamed like a little girl and it took him several minutes to get his breath back.
I laughed until tears came from my eyes.
He never tried to scare me again -
in fact, he thereafter loudly announced his presence when I was busy.
Don't mess with someone who has seen as many horror movies as I have.