A character is having their patience pushed to its absolute limits. Maybe they're fed up with everyone else goofing off. Perhaps they just want to get everyone's attention, but they're being ignored (or everyone else is panicking and they can't speak over the crowd.)

So, they take command. ENOUGH!!!!

Usually, everyone else present will shut up immediatly, and the speaker is now the center off attention. Expect the speaker to have an intimidating voice, or at least a loud one. May also serve as a Pre Asskicking One Liner if the speaker is in combat. May also preceed a monologue that get's everyone's act together.

Typically used for dramatic effect, and by authority figures (usually kings or generals).

Part of what makes this so effective is the connotation of authority: while a call for silence may have the same effect, it can also be used by normal folks to restore order. For someone to just shout 'Enough!', and expect everyone else to can it imples that they're used to having their orders followed. (Or, that they just have the hubris to do so.)

Something worth noting: The 'Enough!' doesn't necessarily have to be dramatic or loud. If shouting the word shuts everyone else up, or at least makes it so the speaker can get everyone's attention, then it works. --

Examples

Web Original

• The Nostalgia Chick does this a lot, mostly when she's watching/reveiwing something that annoys her.

Western Animation

• Codename: Kids Next Door: In Op: G.R.O.W.U.P., Sector V discover that Father's powers are neutralized by ice cream, and begin pelting him with the frozen treats. It works...for a while.
  Father (on the ground, his fires going out:) Enough...Enough...I said... (Suddenly releases a massive explosion that blows everyone back), ENOUGH!!!

• My Litte Pony: Friendship is Magic: Celestia cuts off Discord's rambling with a sharp "Enough!" Notable for being the very first time we see Celestia genuinely angry.

Video Games

• 'Enough! My ship sails in the morning. [[Non Sequitur I wonder what's for dinner?'