I have in the past- and at times I have been taken advantage of and felt quite foolish for it. But... other times, I have given 2nd chances and been pleasantly surprised and rewarded for it. Plus, I am not perfect by far, and have been the one in need of a chance to redeem myself at times- so I feel that I should always offer the same courtesy at least once to everyone.
why- do you want one? just pick up a phone...