Since Lloydie mentioned 'little old ladies', here's one.....
When I worked on the tools, we were working on this rather big project for the National Trust, over the road lived a little old lady, who, through no fault of her own, did nothing but complain about, well, everything, SO, what we did was (this of course is the proverbial WE), mixed some pink thistle (the pink plaster that goes on the wall, in case your female

) and put it in a plastic bag, now cut a little hole in the corner, and squeeze out some of the pink onto a hard surface (like putting iceing on a cake), in a spiral motion so that it looks like a BIG DOG has been and left you a little pressent.
Now then, to add effect, just before the pink has set, dip it into some 'FEB' (mortar plasticicer) to give it a little shine, and leave overnight.
Now for the following fortnight, the job of the first person on site would be to pick up one of these, and place quietly on this lady's doorstep.
When the lady got out to complain about the noise (vans, generators, dumpers, drills etc), the first thing she saw was this 'mound'; and she would dissapear back into the house to gather a load of newspapers, water, disinfectant etc to clean the doorstep, by the time she had finished cleaning it would be 10 o'clock break for the site, bliss.
I bet she wondered why over the month, the 'dog' never visited her on the weekend.