never
Would you play this?

I've played it a couple times it's an okay opening, but it's not for everyone, I'd try it in a few games see how you like it.
Yes, i play this opening sometimes!! This is known as the Budapest gambit and it makes for quite a good position for black after a few moves!!

can you give some lines for continuation ?
Wikipedia has a good page on the main lines: http://en.wikipedia.org/wiki/Budapest_Gambit
To prevent me from spelling. I will not say, would you play this gambit.