My list:
- Rap music
- Seasonal food crazes, like pumkin spice everything, shamrock shakes, etc.
- Trendy food crazes (i.e. raw veganism, juice cleanses, gluten free diets, anything that involves kale, etc. Granted if you're making a dietary decision for specific health/cultural reasons, you've consulted your doctor, done your research etc. then fine. But if you're doing it just because it's trendy, then no...)
- Smart phone apps like snapchat, tinder, etc.
- Selfies
- Disney movies