If you cut off the top of a pineapple fruit and put it in soil, it will grow. Of course, if you live in a cold climate as I do, you have to plant your pineapple in a (large) pot and bring it inside in the winter. I did this several years ago and harvested a pineapple fruit in September, 2008. I cut off the top of that fruit and planted it in a new pot, and now the new plant is flowering. This is what it looked like on March 13th.
More (and larger) photos may be found in the album on my Google Plus page. I will add more photos to the album as the fruit grows.