I tend not to lie. This is partly because i just don't like doing it, but also partly because i have a bad memory. Once when my friend was pushing for a night out out with my wife and me, i was very honest in deed... (sorry but she really doesn't like you). It didn't go down well, but he would have kept on about it forever if i didn't say it.

When i will happpily lie, is when someone has particularly unrealistic expectations of me and without my best interests at heart.

Of course, if i am not asked a specific question, it is easy to simply not supply information