A person who spends too much time contemplating what to do may miss a valuable but fleeting opportunity.

(idiomatic, somewhat dated, Britain, Ireland, New England) A rebuke especially directed towards children for having referred to a woman as "she", instead of using her name or an appropriately respectful title.

(colloquial, originally) A person who calls attention to or complains about a flatus is likely trying to pretend it wasn't their own.

(rhetorical question) Said by someone who, upon the realization that they were kidding themselves, wishes to start thinking in a more sensible, reasonable way.

A rhetorical question used to express incredulity or surprise: who would have guessed it?; who would have thought that would happen?

Alternative form of show who's boss

Alternative form of those that have, get

Alternative form of those that have, get

Alternative form of those that have, get

(slang, humorous) Assertion that the recipient of a communication does not recognize the sender of the communication, implying that the sender is insignificant.