- High impact snipers
- Low impact snipers
- Hawkmoon (with luck in the chamber proc)
- All shotguns
- All fusion rifles
- All grenades
- All supers
- A water gun
- A Nerf gun
- A rubber band pinged from someone's finger
- Paper airplanes thrown from a great height
- A strong breeze
- Heavy rain fall
- A new born baby gently tapping you on the face
- A 50 megaton nuclear bomb
Edit: I fell after reading all the comments that I have to update this list with;
- A kittens fart
- A microwave
- And the salty tears of the destiny forum elites
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Better question yet. What can survive a shot?