Antique German door from 1380 was designed to make it easier for the drunk homeowner to fit the key into the keyhole after a few liters of beer. Alternative reasoning suggests that there was simply not enough light available at night... Source:
I am very impressed with this antique door from 1380 in Regensburg. It’s designed to make it easier for the drunk homeowner to fit the key into the keyhole after a few liters of beer. German planning at its best. Source: