5 Meter brick wall

Manado is one a town in Indonesia which once occupied by Netherland for 150 years. This influence causes many of it's jokes tells about "Grandpa's" (Opa) struggle against Netherland during war..
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5 Meter brick wall
Grandpa: "Grandpa was very brave agains Belanda (Netherland).Though one company surrounded me with weapon in their hand, l didn't move even one step behind."
Grandson: "Wow.. that's great Grandpa.. why didn't you run?"
Grandpa: "That's because there's a 5 Meter tall brick wall against my back.."
Grandson: "Oh, dear.."