For those curious about "no one knows you're a dog" it's from a Peter Steiner cartoon that ran 20 years ago: http://www.washingtonpost.com/blogs/comic-riffs/po

For those curious about "no one knows you're a dog" it's from a Peter Steiner cartoon that ran 20 years ago: http://www.washingtonpost.com/blogs/comic-riffs/post/nobody-knows-youre-a-dog-as-iconic-internet-cartoon-turns-20-creator-peter-steiner-knows-the-joke-rings-as-relevant-as-ever/2013/07/31/73372600-f98d-11e2-8e84-c56731a202fb_blog.html http://www.washingtonpost.com/blogs/comic-riffs/post/nobody-...