Most voters simply don't believe politicians when they say they don't remember something important, according to a poll.
Only 25 per cent think they are genuinely forgetful, while 65 per cent think they are making it up and 10 per cent don't know.
Some major "brain fades", as they have been termed by the politicians themselves, have emerged since the last election.
Act Party leader John Banks "could not recall" whether he took a helicopter ride to the Coatesville mansion of internet magnate Kim Dotcom in 2010.
When a hoo-haa erupted over the appointment of a childhood friend of Prime Minister John Key as head of the Government Communications Security Bureau, Mr Key "forgot" he had telephoned him in Australia to tell him about the job vacancy.