Don't leave me hanging!!

From roosterteeth.com:

You probably want to find out more about my radical new technique. Don't worry, I'm planning on writing my thesis about.

You always hear grammar nerds saying how you shouldn't end a sentence with a prepostion. This isn't exactly one of those cases. Rather, the problem here is ending the sentence with a preposition because they left out the object of the preposition. I think it's safe to assume that he's writing his thesis about the "radical new technique" referenced in the previous sentence, but it could just as easily be something completely different.

Source: http://roosterteeth.com/viewEntry.php?id=1378