I also got a lucky day recently with one of my farmers.
He had just finished some fishing objective by the mountains lake and it was past midnight. He had the "Danger in the Deep" quest active, but not his mining equipment (aside from the pickaxe and a sword). My first intention was to head back to the farm to sell items, sort things and prepare for the next day before going to bed but I finally decided to give a try to the Mines. Maybe I could reach level 5 or 10 before the end of the day ?
How well inspired I was! Upon killing monsters, I got a Prismatic Shard. Level 5 reached. Still going down. Upon killing more monsters, I got an autopetter ! Unexpected surprise! \(^o^)/
Back to the farm and… icing on the cake, I got the rare U.F.O. animation on the shipping screen. \(^o^)/ \(^o^)/
That, was a lucky day.