If you could time travel and visit yourself from 10-20 years ago, and warn yourself about the future using only 2 words, what would they be?

You are offered an opportunity to time travel back and visit yourself at any point in time (of your choice) between 10 to 20 years ago, but you can only say 2 words to your former self, after which you will be immediately thrust back to the present. What 2 words would you choose?