Counselor James Tang: Nintendo hotline—how can I help?
Caller: In Spyro, how many more fairies do I need to get to have 20 fairies?
Counselor: Well, um, how many fairies do you have now?
Caller: Sixteen.
Counselor: Sooo...there's 20 fairies and you only have 16, meaning you neeeeeed... [Pauses, hoping the caller will figure this out himself.]
Caller: I dunno. You tell me.
Counselor: ...
Caller: ...
Counselor: Four. The answer is four fairies.
Caller: Oh. [Click.]