Fizzy Bevereges - I have no idea why people like them. It hurts my mouth, and all I'm doing is drinking air! I stick with water, milk, and orange juice. Seriously, that's all I usually ever drink.
Cheap phone/internet/FaceBook games like Candy Crush, Angry Birds, etc. - I find these pointless and time-consuming. I'd rather play real video games and role playing video games.
Instagram - I've never been on Instagram before, and for good reason. I really don't want to see thousands of people's pictures of places they've visited, food they've eaten, and their selfies.
Manicures/Pedicures - I've never had them, and I don't think I ever will. Maybe I would for my wedding day, if I ever get married, but that's it.