What do you call those pictures with the white border and black background and a caption underneath?

They're usually funny, they have a big title, then smaller writing underneath.





and where can i find them cause i see them in google images and stuff.





i've already tried captioned-pics.blogspot.com





where can i find more? are they just called ';Captioned Pictures?';What do you call those pictures with the white border and black background and a caption underneath?
demotivational posters. go to despair.com. i think thats what you're looking for