The episode was called "Up in the Air", and it's one from the Terri years. It's not actually a pineapple, but the top portion of a potted plant, that does indeed make Jack's head look like a giant pineapple. Probably the best showcase for John Ritter's talents of the whole series.
Three's Company was supposed to be in Santa Monica, California.
Threes company Did you know:John Ritter was the only cast member to appear in every episode of "Three's Company".
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Regal Beagle
March 15th 1977 to september, 18th 1984
Don Knotts!
Twos company and threes a cloud
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Yes, she did play on that show.
Joyce Dewitt
Ralph
threes a crowd