THIS is the shocking moment a cruel prankster reveals to his girlfriend the reason why her run was so uncomfortable - he had covered her thong with chilli powder before they set off.

YouTube joker Hammy TV was slammed by viewers for filming his girlfriend's discomfort as the pair were out for a jog.

7 The clip starts with footage of the thong being smeared with chilli extract Credit: Youtube/Hammy TV

7 The couple were all smiles before they went for a jog Credit: Youtube/Hammy TV

Earlier in the clip, he can be seen drizzling his girlfriend's thong with a pepper extract called Satan's Blood that contains an astonishing 800,000 Scoville Units, which is the measure of spiciness used to chart chillis. The spiciest Jalapeños have an average Scoville count of a 5,000, making Satan's Blood 160 times hotter.

7 The prankster can be seen waiting for the heat to set in throughout the first half of the run Credit: Youtube/Hammy TV

In the clip, Hammy's poor girlfriend can be seen pacing around a park in discomforte.

Seconds later, the visibly distressed woman decides she can't handle the heat any more and pours water down the back of her joggers.

7 The agonised girlfriend tips a bottle of water down her joggers Credit: Youtube/Hammy TV

Most Read in Living A BRIT NAUGHTY How long should sex last? Study reveals the average Brits' time between the sheets 'HUMPTY DUMPY CASE' Horrific CT scans of woman's smashed skull and face shows why you should ALWAYS wear your seatbelt Sex Secrets Prostitute who earns £2,000 a week reveals the average penis size ... and how much she enjoys work LOVE MACHINE Meet Harmony the sex robot so realistic she orgasms…and she’ll even remember your birthday THE PERFECT DAY This is why you MUST make time for morning sex (and the best time to fit wine into your busy day) GO FOR LONGER Here are three ways to last longer in bed, according to a sex therapist

Hammy pretends he has no idea why she's in so much discomfort, saying: "You just poured the whole water on you.

"Are you going back to the house?"

7 Furious and in pain, the girlfriend legs it back to the comfort of her house Credit: Youtube/Hammy TV

His poor girlfriend fires back with a volley of expletives, at which point the prankster owns up to what he's done, confessing: "I put hot chilli extract on your thong."

The furious girlfriend turns around, and fixes him with a death stare, asking: "Are you f***ing serious? This f***ing sucks. It's burning."

7 Credit: Youtube/Hammy TV

She blasts her fella with an expletive-laden rant when he confesses to what he's doneLater in the clip, she can even be seen emptying a carton of milk down her joggers to ease the pain.

Although some viewers enjoyed the sick prank, most people were appalled.

7 Credit: Youtube/Hammy TV

Later in the clip, the poor woman is forced to strip offOne joked: "And this was his last video before his girlfriend killed him."

And another critic asked: "Is this another spousal abuse case disguised as a joke?"

More sceptics claimed the video had to be a set-up and that his girlfriend must have been in on the prank all along.

This isn't the first YouTube prank to divide viewers.

We revealed how a pair of foul-mouthed parents played one of the cruellest tricks imaginable on their young son.

We also shared how one woman played the ultimate prank on her football-mad husband.