Do speaker cables need a burn in period?


I have heard some say that speaker cables do need a 'burn in', and some say that its totally BS.
What say you?


128x128gawdbless
all the new cables I have purchased came with a 30 day return period, and since burn in takes only a week or two, that was never an issue...and all the manufacturers said they would allow more time if needed...
I question whether it's the new cable that's burning in or is it the listener getting used to them?
At the very least a few hours of not being moved. 
Never heard anyone report cables sounding worse after a few hundred hours.