well, most of them don't, but they would if they were fertilized. It would look like this

Interestingly, pineapples almost never reproduce by seeds. Even in the wild, most of their reproduction is vegetative. Why? Their huge, spiny fruits are adapted for being eaten by the extinct megafauna of South America. Ground sloths, Gomphotheres, etc. When those animals went extinct, pineapples and their relatives lost their usual means of dispersion and had to limp by on occasional lucky seed spread and vegetative growth...until humans started growing them.