Actually, lifting a rock off of yourself, or ripping out a knife is totally 100% possible.
Mothers with an extremely strong motherly instinct and enough adrenaline can lift the ends of small cars off the ground to save their child underneath etc. I'm obviously not excluding paternal parents here lol.
As for energy balls a la Dragonball z, i'm far more skeptical.
However, perhaps due to my..."asian-ness and asian beliefs/martial arts beliefs", I do believe in the existence of Ki/Chi, internal energy.
Dodging a bullet, doubt it, unless you were already moving when the bullet was fired. In some circumstances, the bullet will already have hit you before you hear it being fired.
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