
Perhaps it was Nielsen's literal use of English, that made him so funny. Here are a few examples:
Airplane! (1980)
Nielsen (as Dr Rumack): “You’d better tell the captain we’ve got to land as soon as we can. This woman has to be gotten to a hospital.”
Air stewardess: “A hospital? What is it?”
Rumack: “It’s a big building with patients, but that’s not important right now.”
Rumack: “Can you fly this plane, and land it?”
Ted Striker: “Surely you can’t be serious?”
Rumack: “I am serious. And don’t call me Shirley.”
Police Squad! (1982)
Neilsen (as Frank Drebin): “Do you think you can beat the champ?”
Briggs: “I can take him blindfolded.”
Drebin: “What if he’s not blindfolded?”
Briggs: “I can still beat him.”
Naked Gun 2½: The Smell of Fear (1991)
Drebin: “That’s the red light district. I wonder why Savage is hanging around down there.”
Ed Hocken: “Sex, Frank?”
Drebin: “Uh, no, not right now, Ed.”
Naked Gun 33 1/3: The Final Insult (1994)
Drebin: “Sergeant Frank Drebin, Detective Lieutenant, Police Squad.”
Security guard: “Yeah, and I’m Robert De Niro.”
Drebin: “Mr De Niro, we’ve got to get inside.”