Repeating jokes without attribution has been the cultural norm for centuries. The whole notion of plagiarism and copyright and such are the recent inventions.
Thank good nobody cares, that just means that the intellectual property mafia hasn't indoctrinated us so much yet as to destroy any notion of a common culture.
I don't know if this was a typo or intentional, but I like it very much as an unobtrusive and religion-neutral substitute for "Thank God". I will probably use it in future (maybe even without attribution :-) ).
Thank good nobody cares, that just means that the intellectual property mafia hasn't indoctrinated us so much yet as to destroy any notion of a common culture.