when your wife is constantly asking if its oky to use her own sink.

When people start looking at you weirdly when you talk about your own pc.

When the guy at the local car parts shop ask's you if you would like to make an account.

When you stop looking at the DB of a fan and just concentrate on the CFM.

When you have more rads in the house then in you own car.

When you start making your own dye's