[cheebacheeba]

What is this?
I mean...I kinda get the basic idea, but...what?
Some examples:

http://cheezcomixed.files.wordpress....-chihuahua.jpg
http://www.oesquema.com.br/trabalhos...o-cachorro.jpg
http://cheezcomixed.files.wordpress....4297671603.jpg
http://teletube.files.wordpress.com/2008/08/tenso.jpg
http://cdn1.knowyourmeme.com/i/19058...inho_tenso.jpg
http://acidfingers.files.wordpress.c.../tenso2cn8.jpg
http://lh4.ggpht.com/_9hdnZu3LT7A/Sy...umb%5B3%5D.jpg
http://tenso.blog.br/wp-content/2009/11/tensodorgas.jpg

What is this phenomena?