Among the ones I have had, the most interesting one would be when I tried to DS with Naiya.
I told her that I would make her a TARDIS but since I don't know much about them just copied the version of one from the show along with the AI and merely grew it up then sent it to her. I didn't tell her nor journal that it was a copy though.
When she tried to use it, her DG had destroyed it and when she went to complain he said that "it was only a copy", think they argued about that since she didn't know about the copy thing until a day after reading the response of her DG. Interesting, but was not conclusive.