Put dog shit under the door handle of your ex's car door.
Go to the library and get those little postage-paid subscription cards out of all the magazines. Fill out your ex's name and address and return them. Make sure to check the box "Bill Me".
Put Nair or some other hair removal chemical in your ex's shampoo, conditioner, or hair gel.
Purchase several hundred crickets from the local pet store and release them in your ex's home. Even the noise of just one remaining cricket could result in quite a few sleepless nights.
Place Icy-Hot or Atomic Balm on your ex's toilet paper or in your ex's underwear.
Advertise your ex's house for sale in the local paper. Make it sound glamorous and list it very cheap, give the address, and post an open house on a day that you know your ex will be home! Example: 3 bedroom home, 2 bath, pool, jacuzzi, nice neighborhood. $39,500. Open house Sunday June 12, 10 a.m.-2 p.m. 2312 Oak Drive
Purchase a "universal TV remote" from a place like Radio Shack. Hang around outside your ex's home in the evening and keep flipping their channels.
Shave parts of your ex's body while they are passed out drunk. Be creative. Do things such as half a mustache, one eyebrow, reversed mohawk..
Place a dead fish somewhere where your ex won't be able to see it---even when they look (like up under the kitchen sink, between the toilet tank and the wall, or secured up under the front seat of their car). After a couple of days the smell just becomes unbearable.
Call up the utility companies and disconnect your ex's service (you will probably need their social security number for this).
Go to the yellow pages and, starting with the a's and working all the way to the z's, call up every company possible and schedule their service on a particular day and time (that you know your ex will be home). Example, schedule Tuesday at 10 a.m., then watch as your ex's street fills up with dump trucks, repair trucks, etc., all knocking at your ex's door.
Ruin your ex's credit. Have someone of the same sex go to the hospital emergency room complaining of being ill. Have them fill out the hospital forms using your ex's name and social security number. After the bill has been run up have the person claim to feel better and leave the hospital. A few weeks later your ex should get the emergency room bill.
Try to get your ex's name and address on as many junk mailing lists as possible. Whenever you see a business advertise, "Free Information!" call them and give them your ex's address and phone number. Your ex will receive lots of junk mail and phone calls.
Have someone of the same sex pose as your ex and call your ex's bank to report their checkbook and atm card stolen (you will need your ex's checking account number and social security number). Next time your ex goes to use the ATM or write it check it will refuse them.
Order call forwarding on your ex's phoneline. Have the numbers forwarded to a sexline, or anywhere you want!
Okay! And for the best revenge ever--
Get on with life, become a raging success, make lots of money, be better looking than ever, and never, ever, ever give your ex a second thought! It will drive them crazy!