Don't you love messages from Mr. Self-important? He's got a disclaimer in his email signature. "The [misspellings and grammatical errors] you just recieved may be privileged information. If you recieved this message in error, please delete it and contact me immediately." Yeah. Sure. When I get messages in error, I ditch them because who cares? Yet when I see a directive like that, I want to post it to usenet. 

I'm on Obama's mailing list. The Leader of the Free World doesn't have  as much self-importance as some mid-level corporate drones. There's no legal disclaimer; no threats implied or otherwise. The President doesn't ask me to burn after reading. His signature just asks me for money. What is he, homeless?

Did you ever see this? Somebody puts their email address in their email signature. Do they know how email works? Hey thanks. Without that signature, I'd never be able to contact you. How about the guy who actually needs it. "I'd like to contact Bob but all I have is an inbox filled with his messages..."

In 2009, 247 billion email messages were sent daily. Unless you're in the market for boner pills and cheap meds, most of that is spam. Yet if 10% of all messages contain a 532 byte signature (the average of the ones I sampled), the Internets are moving 12 gigs of pointless fluff daily. Some may say that's a small price to keep Mr. Self-important happy but I say waste more bandwidth and post his drivel on wikileaks. You know he wants the drama....