I see ADD everywhere now because I know what it looks like.  It's like buying a car and then you see it everywhere you go.

One of my favorite movies is It's a Wonderful Life.  Uncle Billy had ADD.  He was the straw that broke the camel's back and sent George over the edge because he lost the $5000 and couldn't remember where he'd left it.  He was always tying ribbons on his fingers so he wouldn't forget things. 

Denise on the Cosby show had ADD.  She dropped out of school, then got married in Africa, then forgot to call her husband's Navy office so they would get housing and then went from one idea to the next as to what career she should follow.

When you watch it on tv the people seem funny and quirky, but in real life they can be a real burden with their loved ones always having to bail them out.