I just read a little article on things to do to annoy telemarketers and junk mail senders. Some were pretty funny and creative so I thought I'd share:

• Return ads with bills: When a company sends you ads along with your monthly bill, send those same ads back with your check. Let them throw away their own junk.
• Return unwanted applications: When a credit card company (or other company) sends you those "pre-approved" applications, they often include a return envelope with free postage. Those envelopes only cost them if they are used. So rip the application in half, and send it back to them, costing them money. While you're at it, why not include some extra junk mail and push the weight over an ounce to cost them more!
• Hold, please... When a telemarketer calls and asks for person X, ask them to hold on. Don't hang up and set the phone down and walk away. When the phone makes those annoying beeps, you know the telemarketer has hung up and you probably wasted a good minute of their time.