Post your best ones here.
My personal favourite is a bit of a cheat - a movie within a movie. It comes from 'Ernest Saves Christmas' - a film so bad I don't think it was released until March in the UK.
Anyway, in this turd, there is a reference to fictional film; Christmas Slay - with the immortal tagline
'He knows if you've been bad or good. And he's got an axe.'
So, can anyone better that gem?