Real life:
bent == good ( technically == bad )
nark == bad
negative == bad
Diving:
bent == bad ( very, very bad )
nark == good ( technically == bad )
negative == good ( caveat: see Oxygen )
Oxygen:
Totally taken for granted.
May be toxic.
Can run out.
May not actually be oxygen.
Man.... I really need to go to bed. That's it. I'm going.