Usually if it sounds familier I cut in early with I think you told me this one already, but keep going just so I can check. If it is short/funny I will let them finish it and tell them after that they had already told me but since it was "a good one" I didnt mind hearing it again. Otherwise I cut in and let them know.
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Carpe Noctem: Ph’nglui mglw’nafh cthulhu r’lyeh wgah’nagl fhtagn.
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