The act of driving around neighboorhoods looking for pumpkins in yards, snatching that pumpkin, driving away with the pumpkin, and then throwing that pumpkin at things from the moving vehicle (i.e. mailboxes, cars, lawn ornaments)
Becoming sleepy and needing bedtime visibly, especially when talking about events that might occur past your bedtime.
From Cinderella's "turning into a pumpkin" at a certain hour, here we have events that certain people generally don't get to because it'll interfere with their bedtime.
We tried gettingreservations to <snazzy restaurant>, but they only had a slot at 10pm, which we gave up because Autumn starts pumpkinizing around then.