Don't copy and paste (Score 1)

Please, please, please, no matter how late it is, no matter how much of a rush you're in, don't copy and paste blocks of code when you know deep down you should be generalizing and rewriting that block as a method or function somewhere for re-use. I can't even begin to count how many hours my team has wasted tracking down and fixing the same bugs that were pasted all over the place in legacy code.