Aries
“Let those who never bought Mega Bloks throw me the first brick” is not a valid defense. There are a lot of such people, and you will get bricked to death.
Taurus
Spammers know you so well they will send you emails about enlarging your brick.
Gemini
You will fall under the weight of your event nametag. Try limiting yourself to 1×8 bricks like everyone else, maybe.
Cancer
You will rebel against building instructions and open all bags of your new set at the same time; and you will even go as far as building it on carpet. Or grass.
Leo
You will be cornered by a Bionicle designer who will complain about Exo-force for hours.
Virgo
You will be ready to preorder a thousand of Belville battle packs as soon as LEGO announce it. They probably won’t, though.
Libra
The LEGO marketing department will consider doing an impulse set at a 100$ price point just to match your definition of impulse buy.
Scorpio
You will spend hours trying to find out when “The 50 year brick” is coming to the theater.
Sagittarius
Someone will again publish a MOC based on your own secret design. Start searching your house for cameras.
Capricorn
You will use a troll minifig image as avatar on the Internet forums you visit. It suits you well, actually.
Aquarius
It’s a good thing you get free t-shirts at events, considering your fellow LUG friends will again rip your clothes off you for fun.
Pisces
The heads of all your Technic figures will be mysteriously replaced by Fabuland animal heads.