Airplane!1980

[Elaine and Rumack investigate the fish poisoning]

Elaine:
Doctor, Mr. Hammen ate fish, and Randy said there are five more cases, and they all had fish, too.

Rumack:
And the co-pilot had fish. What did the navigator have?

Elaine:
He had fish.

Rumack:
All right, now we know what we're up against. Every passenger on this plane had fish for dinner will become violently ill in the next half hour.

Elaine:
Just how serious is it?

Rumack:
Extremely serious. It starts with a slight fever and dryness of the throat.

[Oveur starts suffering from these]

Rumack:
When the virus penetrates the red blood cells, the victim becomes dizzy, begins to experience an itchy rash...

[Oveur suffers from those as well]

Rumack:
...then the poison goes to work on the central nervous system, severe muscle spasms followed by the inevitable drooling.

[Oveur also suffers from these]

Rumack:
At this point, the entire digestive system collapses accompanied by uncontrollable flatulence. [Oveur does]

Rumack:
Until finally, the poor bastard is reduced to a quivering wasted piece of jelly.

[Oveur collapses completely at the controls and the plane plummets, people swaying back and forth, and warning sign comes on saying "No Smoking - Rows 11-51, No Sexual Intercourse - Rows 13-51"]