When a bullet ant stings you it feels like you've been shot by a gun. In the above video, watch Dr. Corrie Moreau milk one of these "incredibly aggressive" and alarmingly big venomous ants.

From Brain Scoop:

Researchers are interested in what makes the sting so painful and if this potent neurotoxin could have some medical benefits. To study the chemistry of the venom they need to isolate it, so some brave researchers capture and milk them to extract their venom, just like a snake or spider is milked.

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Naturalist Steven Backshall described what it's like to be stung by a bullet ant in an episode of The Infinite Monkey Cage podcast:

The pain is throughout your whole body. You start shaking. You start sweating. It's completely systemic. It goes through your whole body and it really does effect your nervous system. Your heart rate goes up. And if you have quite a few of them, you will be passing in and out of consciousness. There will be nothing in your world apart from pain for at least three or four hours.

And here's Hamish (of the comedy team Hamish & Andy) putting on a pair of Amazonian rite-of-passage mittens loaded with bullet ants: