Many writers are fanboys, just like us. That said, it is not unreasonable for them to want to throw in some reference to one of their favorite works. Sometimes, however, said element is a bit more blatant, and a lot more physical. This is the idea behind a Cameo Prop. It originally has nothing to do with the work of fiction or the series it is appearing in, but, usually, for sake of novelty, [...] [tvtropes.org]