Although this takes time to set up the results are spectacular, and perfectly legal, maybe. Again this is a logistic puzzle. but worth it...
First set a date in the near future, a month or so, prefreably a Saturday mid morning.
Next comb the yellow pages for services that offer "free estimates": suggestions include house siding, landscapers, roofers, cable companies, contractors.
Take a good couple of days and call them asking for "free estimates" at the addy of your target on the day and hour you picked above. You need at least 50 to make a good showing, over 100 is genius. Use a pay phone if you are too parinoid about phone number coming up on ID or somthing...but doing this well in advance will mask your true id. On D day call the local fire and police number to alert them to strange amount of traffic at target addy as well as local TV news, and at least 10 pizza delivery boys.
Laugh your bellybutton off
For a longer term effect:
Go to local supermarket magazine shelf
Take out all the subscription, no postage necessary postcards out with gloves if paranoid. Get at least 100.
Fill in target addy with left hand, and gloves if paranoid. post from boxes throughout the city.
Trust me, it takes months to "unsubscribe" and the level of junk mail goes through the roof.
If you need more....