Snap, crackle, pop. No, it's not the sound of someone pouring milk on that crispy rice cereal you ate as a kid — it's the sweet explosion of someone cracking their neck or back. No matter how you feel ...

When you get your back cracked — on camera no less — you never know what exclamation will tumble out of your mouth. That’s part of the fun of watching back cracking videos, which have taken Instagram ...