How about..
1. You get sneaky when you/your family is having guests, and you always casually leave a few ponies out for people to see... juuust in case they might go "Oooh those ponies, my whoever/I used to have heaps, I believe they're still lying around in our attic, you might as well get them if you like them!"
Or..
2. You try to trade groceries with baits/ponies or horseshoe points and don't understand why your supermarket won't accept them as a currency.
3. Where you live, people don't refer to you as anything but The crazy pony lady, and you're actually more discussed than the local man who stashes newspapers everywhere in his house, or the nutter who collects empty tin cans because 'they look nice'.
4. You dye your hair in rainbow colors, only wear pants with extra room for a long, silky tail and walk around clacking coconut shells against eachother because you've started to think you're actually a My Little Pewneh..