A.D.D. 
My apologies to anyone who has A.D.D. I do not mean to offend you.
Anyway, I got this idea from my brother who thinks that the entire cast of "Azumanga Daioh" has a learning/mental disorder. He's convinced that Osaka has A.D.D. I can see why.
Anyway, I thought this was funny, so I'm entering it in the "Make Me Laugh" Challenge. I hope you think this card is funny, too.
I found this image on a site that specializes in anime scans and stuff. I cropped it and added the caption in an old version of Photoshop.
