When the main function of your bedroom is to store all your hobby stuff, and you refuse to upgrade your cell phone because "I don't have the money for that", despite having just spent over $300 on a new plane...
When you ask your co-workers if you can go home to fly your RC plane. They tell you that you can after work. You point out that it's dark out when you're done with work. ... Then it dawns on you to get into another aspect of the hobby: night flying.
...When your neighbors get mad at you from using the street as a runway.
...When you almost hit your neighbor's house trying to takeoff in the street.
...When you almost hit your neighbor when you crash in their yard.