The most annoying reply for the first player. Once that he  castled, he needs to think twice if he really wants to break the pin with  the g2-g4 move.
1. e2e4  1... e7e5  2. g1f3  2... b8c6  3. f1b5  3... g8f6  4. d2d3 Not yet an endgame with you, Mr  Carlsen. 4... f8c5  5. b5c6  5... d7c6  6. e1g1 