(informal) An expression used to point out that another person's joke or cleverness has been recognised or understood, either to acknowledge its cleverness or alternatively to communicate a lack of amusement.

(formal or humorous) A question asked to know the reason for being visited by the interlocutor.

(colloquial) You are familiar with the situation I am describing; used to establish common ground with the interlocutor

Said to demand a refund for a product or service.

(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

(physics, chemistry) a phase of water ice which is two-dimensional, amorphous, and may shrink during freezing, unlike most forms of water ice

(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.