Two days before my due date, at 9 pm, I ate a whole pineapple. At 2 am, my waters broke quite dramatically. However, I was not in labour and baby came by C-section at 11 pm on my due date.
My son, on the other hand, was a 3 day induction finished with a really beautiful natural birth.
I don't recommend the pineapple as it can cause your waters to break, but not labour.
Good luck!