There is a "trap" in Sicilian that is sometimes played by jokers:

1. e4 c5  2.Bb5 a6  3.Bc4 b5  4.Bxf7 KxB  5. Qh5+ g6  6.Qd5+ e6 7.Qxa8

Usually the white queen is soon trapped. Is there any way for white to keep the queen?

there are many traps in the sicilian although im not familiar with this one.

basically 2. Bb5 is a very bad move, the bishop hits thin air and can get pushed back with moves black would be happy to play anyway, so black wins a lot of free moves by this.

But then again lack must always be weary of his weakpoint f7. and in this example he gets punished for overpushing.  Its is easy to overlook that the queen will pick up the rook via h4 and d5. therefore black should calmly develop with 3... Nf6 ( eliminating the Qh5+ motive) 

conclusion: 2. Bb5 is not very good

Sicilian Trap

I agree with Achterberg that 2.Bb5 is bad, but my question is if it is bad for black to allow white to play Qxa8. It seems probable that the queen will be caught after Nc6, Qc7 and Bb7, and in that case 3...Nf6 is no improvement for black. Or is there some way for black to keep the queen after Qxa8?

to answer your question, I believe that Qc7, d3 Bb7 is the best way to go for both sides and now Bf4 (or Qa7 Nc6, Bf4 Qa5+, Bd2 Qxd2+, Nxd2 Nxa7 with two pieces for a rook and pawn) Qa5+, Bd2 Qxd2+, Nxd2 Bxa8 again with two pieces for the rook and pawn which in both cases i would prefer black's pieces over white's rook and pawn.

Thank u erad- that´s exactly the kind of comment I was hoping to get.

I think black has better.

 

9.Bf4 Qxf4  10.Qxb7 Qc1+  11.Ke2 Qxb2  12.Qxb8 Qxa1  13.Qf4+ Kg7  14.Nf3 Qxa2 

Black loses a rook, but is ahead in the end. White wins a rook and two pawns for his pawn, bishop, and knight. Black loses the ability to castle and exposes his king, but white is too underdeveloped to take advantage of this before black can respond. A pawn, bishop, and Knight will probably prove more useful than a rook and two pawns, especially in this game.

 

Graw81 is right. e6 is fine. White has lost a move to provoke a6 which fits into the Sicilian Paulsen. White has not developed (Nf3, for example) and Black is threatening to seize the center with d5.