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Those crafty Germans must have timed this one to go off in 2023.

• chiph 4y ago
  After I clicked reply and went to do a chore I thought to myself "I didn't talk about how it's been almost 80 years and it's unlikely to have been a timer." Doh.
• kortex 4y ago
  You jest, but I believe some of these incidents have been caused by some sort of delay mechanism which gets stuck, until one day it is dug up or corrodes enough to unstick, at which point it goes off.