I'd go chasing after myself, make a huge, flopping lunge as my younger, former, more stupid self picked up the phone to call some guy who was all wrong and scream, "NNNN-------OOOOOO!!!!!!" ("Slow-motion" like in a good action film.) Then I'd tie my old self to a chair until I grew older and wiser because I know I'd be way to stubborn to listen to anyone, even myself.