No but a realy bad archer does it quite often.
Depends which way you want it to curve. I think most can make it curve down!
I have never heard of this and would not even think it to be possible. <br />
If you have ever seen an arrow in flight in slow motion you would see that it is not a very smooth, flat, straight, flight to begin with.
Maybe if there are strong winds?
That doesn't sound like a good strategy for hitting the target. Shooting straight would surely be the ideal.