a

I think it's called the Bowlder attack. Its basic idea is "Huh. C5? Well I'm still going to attack f7 to try for checkmate." And indeed, 2...e6 makes it looks silly.

You can play 3...d5, or develop some more first and then play it later. Its an equal position.

From our dear friend wikipedia, "2.Bc4 (the Bowdler Attack), though once played at the highest level, is popular today only among club players or beginners who are unfamiliar with the Sicilian and are looking either to attack the weak f7 pawn or to prepare for a quick kingside castle. However, after a move such as 2...e6, Black will soon play ...d5 and open up the centre while gaining time by attacking the bishop." More or less what Scarblac said. By the sound of it, it seems you can make your friend pay for using this opening.