Non c'è due senza quattro (1984)

2 Bud Spencers and 2 Terence Hills in this one; they play two Brazilian millionaires with many enemies AND their exact lookalikes, a saxophone player who is often in trouble with the law and a daring stuntman, who are hired by the millionaires to impersonate them for a week.

No doubt you are familiar with the term "one-joke comedy". Well, "Double Trouble" is a little better than that: it's a two-joke comedy. The first joke is that the rude and crude lookalikes try to adapt to the real millionaires' lifestyle and end up turning it upside down, and the second is that only one Hill-Spencer pair can fight as usual (guess which); the other two are snobbish sissies who always run away from fights. It's fun to watch Hill and Spencer playing against type (half the time), and Spencer in particular gives one of his most joyful performances. And the editing that allows all four of them to be on screen together in some scenes is seamless. But during the long segments between the fight scenes, I completely lost interest in the movie. (**)