I can explain this in a scientific way.
Steak = Good
Icecream = Good
Therefor Steak + Icecream = Good?
Oh Contrair
Steak + Icecream = Bloody Awful
Replace Steak with Aliens and Icecream with Predator.
Aliens + Predator = Bloody Awful
There you go Genius, Turks if you need help getting your dissertation done just give me a shout im on a roll. 😉