I think I've heard this one. Its a Brutus of Wyde classic... per
Dingus  They came back to OCC from lunch one day to find an odd
'contraption' in the office. A stack of tech manuals and phone
books had been arranged to create a set of miniature stairs,
each step a half inch or so, leading up to the top step.  The
top step of this pile ot tech manual stairs was level with a
trash can. The trash can was a few inches away from the pile of
books. Inside the trash can was a mouse and a single sheet of
computer paper with a brown smudge on it.  Brutus was no where
to be found but they all knew it was his work.  So he comes back
from where ever he was, looks in the can and see's his mouse.
The back story she told me - see they all knew there was a mouse
in OCC. So the Pest Control was schedule to poisopn the joint
the folllowing day. After his collegues left for lunchy Brutus
created an elaborate yet stunningly simply mouse trap with
whatever he happened to have at hand - tech manuals, a sheet of
paper (gang plank)