Forum posters.  First you are one, then you hate them all, and then you are one again.  Here's Bob Odenkirk showing how posting Amazon reviews can make you feel better.

http://www.newyorker.com/online/blogs/shouts/2012/09/one-star-amazon-reviews-make-me-feel-better.html

Thanks to the New Yorker for re-printing this great piece from Odenkirk & Cross's old web page.