r/CrappyDesign and r/crappyoffbrands (aka CrappyDesign and crappyoffbrands) are two famous subreddits that posts design fails and funny knock off brands.
An example of a post from r/CrappyDesign
About 
Edit
CrappyDesign:
Objects of existence that have a bad, funny, weird, failing design
crappyoffbrands:
Bootleg brands and movie mockbusters
Community content is available under CC-BY-SA
unless otherwise noted.
