I'm sorry, but this is horrible.
Anyway, off the top of my head, my mom wouldn't let me watch MTV throughout my entire childhood and adolescence. I still did behind her back, though.
She also wouldn't let us have any rap music in the house. This didn't affect (effect?) me, but it did my brother.
Once my brother and I had amassed three video game consoles (NES, SNES, and N64), my mom wouldn't let us get any more unless we got rid of one, because we "already had too many video games." That might not seem weird, but she wouldn't even let us have any more even if my brother and I paid for it ourselves. My brother and I both wanted a Playstation, but neither of us wanted to get rid of any of our Nintendos, so we never had any Playstations growing up. By the time the Game Cube came out, I had pretty much stopped playing video games and my brother moved out to college.
OH This one applied to my brother only: When I first started learning guitar, my brother was not allowed to tell me I suck or discourage me, or even tell me to stop playing unless he was trying to do homework, study, or sleep. I didn't even know this until my brother told me this as an adult. He said at first he always wanted to tell me to stop because I sucked, but as I got better he actually enjoyed listening to me practice.