No matter what happened, that's only once, it's shame on you
You come up and here and do it again then its shame on me

from Mystikal – Bouncin' Back (Bumpin' Me Against The Wall) Lyrics on Rap Genius

There’s an old saying in Tennessee — I know it’s in Texas, probably in Tennessee — that says, fool me once, shame on… shame on you. (Fool me — you can’t get fooled again!)[
http://www.youtube.com/watch?v=eKgPY1adc0A]

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