So surprise surprise, it appears there's an alternate reality where John Carmack was working on time travel technology all along (who knew?). Apparently it's something to do with lasers and junk... No, literally. It's powered by recycled Coke cans. But that's not important.
Fast forward 10 years and Carmack-Garriott Inc (A division of AppleValve-DisneyCorp International) have finally made the technology available to the public.
They managed to shrink the room-sized laser weap... erm ... device to about the size of a Kinect camera and your early-adopter future self has plonked down almost their entire life savings to get one.
The one-time use device has only one button labelled "10 years into the past". It will work for 5 seconds before depleting its fuel and shutting down for good. Sounds awesome value for money!
So your future self whacks the button and travels back the 10 years to right this moment, appearing before you as a barely visible wisp of smoke. They are unable to interact with any objects in the area, but they are able to whisper something to you...
...what did they say? *
*Assume that it's not "Invest in Apple shares" or "Don't waste our hard-earned life savings on this rubbish"
- I'm thinking my future self would just say something to mess with my head like "Watch out for the rabbits... they started the whole thing!"
- or "The Xboxes... they said they were safe! But then ..."
- or "We cured everything.. but it all relies on you telling ..."
tl;dr - "What would you in 10 years say to the you of right now?"