Pumpkin seeds growing inside a pumpkin - only opened up the pumpkin, add a little soil and water, and watch the seeds (which were already inside the pumpkin) grow. DO NOT scrape or "clean" out the pumpkin.

 http://www.growinginprek.com/apps/blog/show/10212678-fall-growinginprek-update
 http://littlelearningwonders.blogspot.pt/