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When a dad says half an hour but it's really just enough time for him to finish his coffee and forget he ever said half an hour.
Dad: 'I'll be back in half an hour.' (He comes back 12 minutes later with a full cup of coffee.)
Mom: 'He said half an hour.' Dad: 'I was on the toilet.'
Dad: 'I'll be back in half an hour.' (He's still there when the kids go to bed.)