I never had the gumption to sneak in a party when my folks were gone. The beatings I got for inconsequential matters were so over-the-top I didn't want to risk the one I'd've got for throwing a shindig.
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Best "busted for having a party story" I've heard from someone I know: A friend of the family had a maximum blowout at home when she was about sixteen and her parents went to Florida for the weekend. Intending to party the whole time they were gone she started the party on Friday night, a few hours after her folks left. About midnight she was out on a lounge chair by the pool making out with her boyfriend when one of her friends called out, "Hey, Barbara! Your Mom's here!" She responded, "Ha ha very funny. My Mom's in Florida."
From the just inside the patio door her Mom quietly said, "No I'm not."