(rhetorical, often humorous or ironic) Used to announce a fact of which the addressee was, or appeared to be, ignorant.

implyies that the situation has happened a lot to the person

(rhetorical question) Expresses interest in doing something.

The phrase used in the guessing game I spy.

Appended to praise of oneself or one's own doings, as a form of modesty.

I don't have any money

an answer of acceptance to an eagerly-awaited question

Indicates that the speaker does not want to discuss a particular topic.

I don't want to buy anything

(humorous) What can I do for you?