To be honest I can't really think of anything. My parents were always honest with me. And if they thought I wouldn't understand something yet they would just tell me I'd understand when I was older instead of telling me. (Which was usually indeed the case.)
That's probably one of the reasons why I see honesty as always being better than keeping secrets or 'white lies'. Though trying to be/being tactful is important too of course.
EDIT:
On second thought, there was one lie I do remember. That all drugs, even marijuana are dangerous for you. I don't recommend anyone to start smoking, but marijuana isn't dangerous for you. Not by itself at least.
That's probably one of the reasons why I see honesty as always being better than keeping secrets or 'white lies'. Though trying to be/being tactful is important too of course.
EDIT:
On second thought, there was one lie I do remember. That all drugs, even marijuana are dangerous for you. I don't recommend anyone to start smoking, but marijuana isn't dangerous for you. Not by itself at least.