I think I will be back
What your dad said before he went to get milk and never came back because he got stuck in a toilet
Dad: 'I think I will be back.' 1 hour later: he was stuck in a toilet at the gas station.
Dad: 'I think I will be back.' 2 hours later: he was arguing with a bagel.
Dad: 'I think I will be back.' 3 hours later: he was eating a bagel and still stuck in a toilet.