Okay, I finally a good one, this is what I do alot...
You know you're a grower when...

You are in the gardening section, buying soil, pots, etc... put it in your cart, buy some lights, alluminum foil, etc... (standard pot growing shit) and get paranoid that everyone in the store KNOWS what you're going to do with those materials... I mean, I sometimes seem to forget that there are other plants that use the same thing, lol...