OKLAHOMA CITY, OK (KTRK) -- One man in Oklahoma has a nasty surprise for thieves trying to steal packages from his porch.John Karlin knows firsthand what it's like to have packages stolen. Earlier this year, thieves stole medication and a costume off his porch.So now he is scaring off thieves by creating crazy concoctions -- even using dog waste.Karlin said, 'I have different surprises in each one. You may have a broken Xbox, a dead squirrel and duck sauce here. Some dog poop, so you never know what you're going to get when you steal stuff off my porch."Karlin hopes the idea catches on, and says that he thinks everyone should protect themselves especially this time of year.