It comes up in pratically every psych class I've had, so I do know it. My instructor last semester gave us really good examples of the differences that I usually use as a guideline, but I just couldn't remember it today.
Positive reinforcement: candy
Negative reinforcement: Tylenol when you have a headache
Positive punishment: getting punched
Negative punishment: no dessert
Hopefully the 2 wrong answers I put will turn out to be a positive punishment, so chances of me forgetting it in the future are lessened.
Like a firework unexploded
Wanting life but never
knowing how