It's known by at least three names, the Ware Defense, "Corn Stalks", or the Snagkeouss Defense. The Snagkeouss is slightly more detailed, with the extra move:
1.e4 a5 2.d4 Nc6
(- taken from Bill Wall's "ECO codes with names", http://www.geocities.com/siliconvalley/lab/7378/eco.htm)
what white opening starts with e4 a5 ?...
And a possibly next is knight c3 (to defend those pawns)
- Or pawn g3, and get a bishop behind it.
- Or d4
- Or b4
me as blacks responding Bishop b5 seamed to end this attack (oponent paused for quite a while) (white cant advance white rook to a4, or play d4)
I wouldnt think this is an opening, but i played it twice today, the chance of such a game start is by itself almost nihil, me playing black having it twice against stronger players in a day makes me wonder is it an opening i'm not aware of ?