Do speaker cables need a burn in period?

Perhaps listen to your cables when they are new (no burn in). Have a friend take your cables for a week or so. Tell him to burn the cables in or do nothing, but don't reveal it to you. Listen to the cables again for the obvious difference in sound and confirm your findings with him. Then feel good that at least this audio myth didn't cost you any money.

If someone sneaked  into your listening room and replaced your cables with the exact same cables that were not burned in, how long would it take for you to notice the difference in sound? 
If someone gave you a 10 to 1, $ bet that you could pick out the the direction of your cables with a blind listening test, how much money would you risk? 
For me, the real crime in these discussions is the suggestions that the difference in sound with these tweaks make an obvious difference.

Do I need to burn in the radio frequencies for my wireless stereo?