Coffee with dangerously high caffeine content may keep you up for 18 hours

This cup of coffee will last you all morning.

And afternoon.

And night.

A barista in Australia has created a coffee combination so potent that it promises as much as 18 hours of "up time." It also packs in half the amount of caffeine considered to be legally safe to consume in the country. It's a real upper, Down Under.

So what exactly is in the "Ass Kicker" coffee, created by Christies Beach coffee shop Viscous Coffee? What isn't in the drink would be a better question. The brew contains a quad shot (four shots in one) of espresso, four ice cubes made from 48-hour cold drip and 120 milliliters of extra-aged ten-day cold brew. Plus, the barista adds four 48-hour cold brew ice cubes for an extra kick.

For comparison purposes, a regular cup of Joe contains around 100-200 milligrams of caffeine while a single shot of espresso has around 60 milligrams. But the "Ass Kicker" will likely do exactly what its title suggests; it has five grams of caffeine and is about 80 times stronger than a shot of espresso. That's about the amount of caffeine the FDA says could lead to an overdose. In fact, the FDA recommends a maximum of about 400 milligrams a day (or four eight ounce cups of coffee). Without set criteria, however, scientists generally agree that around 10 grams of caffeine can lead to death.

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