thereby hangs a tale
That detail or incident reminds one of another story, as in So he went without supper, but thereby hangs a tale. This expression, embodying the pun on tail and tale, was used by Shakespeare in at least four of his plays and presumably was well known before that. [1500s]
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| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |
| a gadget; dingus; thingumbob. |