i'm quite impressed with 1.e4 c6 2.d4 d5 3.f3 Qb6 as a sharp line for Black
i used to play 3. ...dxe4 4.fxe4 e5 and get checkmated horrifically. Thank you Ivanchuk for bringing it to my attention.
Also, isn't it always a good idea to play 1.e4 e5 2.Nf3 and not 2.f4! until they play the Petroff or the Philidor? :)
I'm also interested in 1.e4 e5 2.Nf3 Nc6 3.Bb5 g5?! as a lethal blitz weapon...can i use it v. 3.Bc4? likely not :)