1.Nf3 f6 2.e4 d5 3.e5 Bg4 4.Bb5

Black can play 4...c6 5.Bf1 e6 (or 5...Nh6 6.d4) 6.d4 Nh6 (or 6...Na6 7.Bxa6) 7.Bxh6.