if u r in a situation in which u have to keep only2 things with u, what u r going to keep?
As an answer. most people will stop first to think what kind of situation they are in. which is normaly a part of human nature to not give a quick answer for some people .

So if y r the one who was asked this question ! are u goining to have a break before answering or u will immediately a quick answer?? . ! .