You've started replacing swears with references to the gods (i.e.: Oh my gods. Holy Hera. I swear to Zeus.)
You've analyzed too many times to count which of the gods would have been attracted to your mom/dad to make you
Orange and/or purple have become your favorite color
You've read/written Percy Jackson fanfiction (admit it)
You've drawn Percy Jackson fan art
Green eyes have become massively sexy (bow-chicka bow bow)
If anyone pronounces a Greek term wrong (or anything like that) you HAVE to correct them
That episode from My Little Pony when Cerberus escaped Tartarus actually made you excited (it's alright to feel a little ashamed)
It's hard to look at spiders
Your head has automatically made the cause of weather something to do with the gods (like if you see a storm cloud, you automatically wonder what upset Zeus)
You've prayed to the gods (if even in jest) for one reason or another
Every time you see a little kid with the eye/hair color a mix of Percy and Annabeth's you want to squeal (like I babysit for this little girl with bright blond ringlets and perfect green eyes. It's incredible)
You've shed at least one real tear while reading any of the Percy books
Your nickname/penname/username for anything has something to do with the Percy books
You own at least one article of clothing/jewelry/accessory that's related to the books
You've watched movies with Logan Lerman or Alexandria Daddario just for the sole purpose of their roles in the Percy Jackson movies
You have a PJO wallpaper on your phone or computer
Characters from PJO have their own theme songs in your head
You've gotten into something a character is into just to feel closer to them (i.e. architecture)
You've sticky-noted (or memorized page numbers of) your favorite parts in the books so you can go back and reread them
Any time you see either of the Percy Jackson movies you get a hernia of disgust and shame
You've already decided in your head what the names of Percabeth kids would be, and even what they'd look like
You refer to Rick Riordan as Uncle Rick
You have a special folder in your computer just for PJO pictures and stories and whatnot
At one point in your readings you've actually slept with one of the books and told it good night before (don't deny it)