There are plenty of reasons you can be angry at your former self.
The ones that typically get attention tend to be mistakes along the lines of substance abuse, staying too long in toxic relationships, a failure to take school seriously, incurring debt, et cetera.
But there are less dramatic reasons to wish you could go back in time and give yourself a good talking-to.
Take dental fillings, for instance. If you don't already know it, you will one day: They don't last forever.
So even if you do a decent job of taking care of your teeth in 2013, a lackluster performance on that front in the previous century can come back to haunt you.
Still, I doubt anyone will be including that in a movie.
"I am the ghost of your oral hygiene future and I come bearing floss."