Flat out lies:
Mom, I did NOT hit my brother.
When said brother has a bloody nose.
Do you like my sweater?
And lies of omission:
Were you at Cole's house?
I was...(unsaid) but in the meantime I was also at Sharik's house and Casey's house...where I know I'm not supposed to go without permission.
So while the technical answer was correct, the SPIRIT of the answer was violated and makes it a lie.
And lies are bad.