[reuben_tate]

Playing devils advocate, I think that the person making such a ridiculous claim in the first place should attempt to formulate their argument such that the ending conclusion doesn't seem as ridiculous. For example, the claim that "1+2+3+4+...=-1/12" sounds incredibly absurd without any other context. However, properly taking the steps necessary to build up to a such a conclusion can make the statement of the conclusion seem not as far-fetched.