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When your dad says he's going to get milk, he's really running away from your mom like a coward, and he probably won't come back unless he's out of cigarettes.
Dad: 'I'm getting milk.' Mom: 'I'll be back in 5 minutes.' (He never came back.)
Dad: 'I'm going to get milk.' (He was gone for a year.)
Dad: 'I'm getting milk.' (He got a new girlfriend.)