Wrapping presents, there's the cellotape noise.
This alerts passerbys.
"oooh so what's going on in there?"
"Nuthin' - now listen 'ere & listen good. You step 1 millimeter into that room, I'll vaporise ya."
*Sticks computerpaper sign on door:
"trespassers will be liquidated"
Wrapping presents today.
Naturally my presents are so badly wrapped, they are like a great mish mash of sellotape & large balls of discarded wrapping.
It's only through their sheer size that you'd surmise there's *probably* something in them.