Screeeeeeeeeech, screeeeech, screeeeeeeeech (imagine the sound of finger nails on a chalk board here), tap, tap, tap.
"Hmmmph, that didn't get their attention, I'll just "mosey" up here for awhile and wait for some unsuspecting person to walk through this door...mhwaa,ha ha (think Bela Lugosi's voice here)
"Oh drat, and I was wanting to scare somebody good today!"
"Hey, you lookin' at me or something? I'll be back..." (think Arnold Schwarzenegger here).