You wouldn't think that 'Step Brothers', a comedy directed by Adam McKay, and psychological horror 'The Lighthouse' have much in common.

But Twitter user dom nero (@dominicknero) has found enough commonalities to put together a rather ingenious edit. The former stars Will Ferrell and John C. Reilly, as two grown men who become step brothers when their parents marry.

They eventually become the best of friends, but there is a lot of tension and conflict before that, which this "trailer" exploits.

'The Lighthouse', meanwhile, sees Robert Pattinson and Willem Dafoe play two lighthouse keepers who slowly lose their grip on reality.

It's black and white and gets pretty effing weird and dark.

So yeah, here's the mashup you never knew you wanted, but we're delighted to have.