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1.
After someone tells a boring or mundane story, or a joke that nobody laughs at, conclude it by explaining that a volcano erupted afterwards
Olivia: I was doing my washing up when the sink overflowed and my feet got wet.
Mike: And then a volcano erupted.

Eric: Why did the chicken cross the road?
Alex: Why?
Eric: Because there was no traffic coming.
Alex: And then a volcano erupted.
by ManfredPang July 02, 2011