Used when person, website or anything is giving you too much infomation.

Used when walking out of a room or going to bed, or having time out, switching off from exterior stimulus.

Used when feeling vague, tired or absent minded.

used when closing PC computer programs.

The best way to save any important document

shortcut key for nearly all Windows Operating Systems to Close the active window or application.
Also used as an insulting tool by the 1337 or l33t people to have a bad/angry gamers, aka noob, to trick them to quit the game.

Used in online games to 'pwn'/scam 'nobbies' due to the fact that this command closes your current open window.

if u want to achieve something in your life press that button

Often used to discourage n00bs, this is often said while playing a game or talking in a chat room. Usually results in never seeing the n00b again.

The (not so) secret key combo that every teen must know. Pressing Alt+F4 on an active window closes that window instantly, which is useful especially if you're on something you're not supposed to be on. It works on Windows and Linux, however on Mac, you must instead press command + Q, and if you use a Chromebook, the closest you will get to alt+f4 is Ctrl + Shift + Q, which logs you out if pressed two times.