Really freak them out, start dressing like a hells angel, park a motorcycle out front, have your friends come over on bikes dressed as bikers. Then go next door and say "I am cooking up my next batch, can you let me borrow some baking powder or Epsom salts?"
Also put your stire plate with flask with your starter in it on it on the kitchen counter and leave the blinds open so they can see in.
When I am brewing, I will have my starter outside to slowly warm up from the cold crash while I brew, so they see my top tier stand with 3 burners, 3 kettles, a pump, silicone hose, my chiller, all my ingredients , tools including my thermometer, refractometer, pH tester, baggies with hops, gypsum, irish moss, etc and my big Erlenmeyer flask. And I usually have a beer in my hand.