Britain's Got Talent fans reveal they were 'left feeling sick' over a 'disgusting' act as crowd boos a contestant during the live semi-final.

The beloved ITV variety show returned to our screens last night (29 May) for the long-anticipated semi-final, but audiences have been left in utter shock over comedian Ichikawa Koikuchi's pungent performance.

Let's just say people were far from gassed to see his performance...

ITV

The comedian took to the BGT stage last night hoping to win over the crowd and earn himself a spot as a finalist, but this was the farthest thing from the case.

The act in question saw Ichikawa sit down on a table in front of a jam-packed audience before he started adjusting and fidgeting with his trousers.

Taking no time to quite literally get down to business, Ichikawa positions his rear end up towards a microphone and starts letting out a whole series of farts.

While the crowd laughs a bit at first, things soon take a turn for them - as well as the judges and Ant and Dec alike - who all clearly start to visibly feel uncomfortable and straight-up repulsed by the whole ordeal.

ITV

Then, to make things even more bizarre, the comedian proceeds to performa a 'sym-FART-ny' of Canon in D - string quartet and all included.

Yes, you read that right.

The audience erupted into a chorus of laughter and cheers at the absurdity of the whole thing before Alesha Dixon slams her red buzzer.

Bruno Tonioli follows shortly after with the red buzzer, followed by Amanda Holden - who by the way was holding her nose the entire time - before reaching the end of her tether and following suit.

To make things even more bizarre - two ballerinas then come out to dance to the peculiar percussion Ichikawa performed.

Surprisingly, Simon Cowell was the last night to press his red buzzer, at which point the crowd can be heard booing and jeering the contestant.

Twitter/@SHADESOFTAEMIN

Outraged viewers have since flocked to Twitter to share their reactions to the extremely peculiar act.

One Twitter user penned: "This is horrible and so incredibly awkward to watch I want to cry."

A second wrote: "Really hit an all time low with this one, how the heck can this act get allowed to through to the semi-finals? Bit of a sickener for all the acts that don’t get through."

"Might just be the worst thing I’ve ever seen on Britain’s Got Talent!" claimed a third.

A fourth added: "The most disgusting act, I think if I auditioned this year and saw this beating my act I’d be annoyed, how dare he take a place of someone who truly deserved it."

"That farting act made me feel sick!!" revealed a final BGT viewer.

Unsurprisingly, Ichikawa did not make it as a finalist.

The second live semi-final of BGT returns to ITV this evening (30 May) at 8pm.