Non-healthy? Try not to go there. Well it's not really trying these days...honestly couldn't stomach a bag of Doritos.
I really enjoy me some Udi's granola though. The Hawaiian blend is the snack equivalent of crack.
Clif Bars are a favorite. I usually keep one in my daypack for hikes and have a builder bar after workouts or long skateboarding sessions. Or if I'm feeling too lazy to cook I might have one when I'm just at home playing guitar or browsing knife sites.
Bananas are cheap, healthy and tasty. So are boiled carrots (though most don't agree with me that they're tasty). Cucumbers, mango, pine apple, cantaloupe, broccoli, corn, grapes...a lot of these are really good. Some are easier than others to eat on the go. Peeling veggies is great for a knife knut because it lets you enjoy the way hair whittling sharp edges effortlessly cut the skin off.

I like to take a lot of different veggies, cut them up and toss them in a skillet with a bit of soy sauce and some sort of meat.
Nuts are another easy way to fill up in between meals. I'm boring and stick with almonds and peanuts generally.
That's about all I eat as far as foods you don't have to prepare and cook.