Keep calm and don't make a fuss:
http://www.standard.co.uk/news/london/couple-find-unexploded-world-war-ii-bomb-in-their-basementbut-delayed-calling-police-because-they-a3263596.html
Awesome neighbours sound like the sort who give you a months notice before a party then it isn't even loud.
@Oliver Schick started
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Keep calm and don't make a fuss:
http://www.standard.co.uk/news/london/couple-find-unexploded-world-war-ii-bomb-in-their-basementbut-delayed-calling-police-because-they-a3263596.html