Once upon a time there was a field of genetically modified plants.
And everyday scientists from around the corner would come out and observe and record data.
Until one day they were exposed to a new spore that quickly spread throughout the field.
And because of this they all had different reactions to the exposure ranging from mild to extreme.
And because of this the scientist concentrated on collecting data and taking specimens from the extreme cases.
Until finally they discovered the cause and were able to re-modify them to grow bigger, stronger, and faster.
And ever since that day the plants in the field have been the official pumpkins used in all carving contests.