So if you're like me, I'm sure you get at least 3 credit card applications per week in the mail. I saw this on 60 Minutes (yea, why was I watching that?), that since they always send you postage paid envelopes, just send it back. I used to just tear it in half, then throw it in the recycling basket. It's so much more satisfying to fold it back into the envelope they gave, and have them foot the bill to get their own junk back. I even fold up the envelope they sent the original letter in. Make sure to tear off any info to avoid revenge from the credit card company, and have fun.
"Why? Cuz Fuck 'em"