Seriously? Let me guess, you wasted your class time watching Citizen Kane and The Third Man and skipped the Bud Spencer/Terence Hill pairings (circa 1970 and onward)?
Bud Spencer (the fat guy) was an olympic swimmer, Terence Hill was a very famous Italian actor that didn't speak Italian. He was originally cast in films because he looked a lot like one of the most popular Italian actors of the time, Franco Nero - famous mostly to American audiences as the bad guy in Force 10 From Navorone. Put that in your film school cigar and smoke it!