Mainly because I can't think of a fucking theme, dammit.
For you HAVE to have a theme for your Tumblr. Whether it's dead dictators doing stuff and/or things, or owls in need of a Powerade and a kebab, Ben Hilfenhaus style, theme is king of Tumblr. And I've got NUTHIN. Nothing that would last more than a handful of posts without petering out to dismality.
If I did have a Tumblr it would be probably called SPOILER ALERT. And it would look something like this:






...At which point I'd already be starting to reblog (an e-hipster term meaning 'steal') content from other sites, a clear sign I'd run out of ideas (a phrase for which there is no e-hipster term). The only response to which would be to start posting pictures of dodgy personalised plates:




That last one was a BMW, but you probably guessed that anyway.
The Doctor is OUT. Of Tumblr ideas, particularly.