FIRE IN THE HOLE

'"Fire in the hole"' is a standard warning, used in many countries in the world, indicating that an explosive detonation in a confined space is imminent. It originated with miners, who needed to warn their fellows that a charge had been set.
The phrase was subsequently adopted by the United States Army and Marines to give notice that a grenade or satchel charge was being tossed into a bunker, spider hole, or other enclosure. It is not used for all explosions — throwing a grenade in the open is not announced, for example — only those surprisingly close.
This phrase is used extensively on film and TV sets by the special effects department whenever setting off effects charges of any nature (from weapons that fire blanks to a blood squib to huge fireballs). It serves as as a warning to the crew that a loud sound is imminent and as a final warning to stop the shot if there are any problems in any department. As a result the phrase is frequently used in ''Mythbusters'' due to their extensive work on set as Special Effects technicians.
Thence, through action movies, it became a publicly-used catch phrase, serving as a generic warning that something startling is about to occur. Examples of this use include the following:

★ It is used in the construction and contracting trade, for example when discharging a nail or rivet gun indoors.

★ It is used in the online shooter video game ''Counter-Strike''; playing characters shout the phrase automatically whenever a grenade is thrown.

★ In the movie ''Over the Hedge'', a skunk named Stella yells this before she sprays.

★ It is the name of a prank played at fast food drive-throughs in which a drink, after being ordered and paid for at the window, is thrown back into the restaurant at the drive-through employee by the driver, who then proceeds to make a quick getaway. [1]

★ It is used to serve as a warning to someone taking a shower or bath that the water temperature is about to rise suddenly because a toilet is about to get flushed.

★ It is a catch-phrase of the title character in the semi-satirical computer game Power Pete.

★ It serves as the title of a Steely Dan song (appearing on ''Can't Buy A Thrill''), a Van Halen song (appearing on ''Van Halen III'') and a song by thrash-metal group Lääz Rockit. It is also the title of a song by punk rock band Ann Beretta.

★ Recently, the phrase has been expanded to describe a variation of a popular breakfast known as "egg in the basket". Typically, hot chili sauce is poured into a hole in the bread, just prior to cracking an egg into it. In such cases, sauces derived from habanero peppers are most commonly used, for the cinnamon flavours that become evident once they are fried. This ingredient makes the resulting breakfast reminiscent of french toast. Other variants include chipotle based chili sauces, although it has been contended that the (now discontinued) hot sauce, known as Blair's Smokin Hot Pot, yields a more desirable result. This particular usage of the phrase was first employed in Sydney, Australia.

★ At the corporate office of the nutritional supplement company Reliv Inc. in Chesterfield, MO, the phrase is used in the call center to alert fellow coworkers that a print job has been sent to the central printer.