Things I used to avoid even when they were fake:

-moving while looting makes your chances to get something much lower so stop moving while looting (if you can... >.>)

-Corpses can hear you or your thoughts, If a corpse hear you saying "bitch..." or "asshole" after he gives you nothing that corpse will tell the other corpses about you and you'll have a hard time looting. (My looting actually went poor after I called a corpse bitch..)

-Looting cars on their bumpers is not recommended.

Yeah I was that paranoid...