I have no recollection
When someone tries to act like they're not guilty, even though they're clearly guilty and probably forgot the crime in the middle of it.
The president said, 'I have no recollection of taking that bribe,' while his lawyer was already counting the cash.
The teacher said, 'I have no recollection of letting you cheat on the test,' even though she was the one who gave you the answers.
The dog said, 'I have no recollection of eating my neighbor’s shoe,' even though it was still attached to his foot.