Trick or Treat?

Trick or Treat? is a daily quest in Fallout 76.

Quick walkthrough

 * Talk to Jack O' Lantern at the pumpkin house.
 * Collect 10 pumpkins and return to Jack.

Detailed walkthrough
While traveling through Appalachia, the player character may receive a prompt to visit the pumpkin house and subsequently speak to Jack O' Lantern. Jack O' Lantern will lament the rapid decaying nature of pumpkins and task the player character with bringing it ten pumpkins for its purposes.

Jack will mark several nearby areas on the map where pumpkins can be collected. However, as long as the player character has ten pumpkins in their inventory, the quest can be completed, regardless of where these pumpkins are from.

After handing over the pumpkins, Jack O' Lantern will provide a reward. This reward always includes some pumpkin grenades, the plans for crafting the grenades (if not yet known) and radioactive pumpkin seeds which are a necessary component for crafting the grenades.