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There's a lot that could potentially go wrong on a wedding day.

But if you're a plus one at the big day, the last thing you want is to be the one who causes a scene.

A man says he was left cringing after his phone accidentally started playing porn in front of a room full of guests at his girlfriend's sister's wedding.

Writing on Reddit, the anonymous man said he offered to sort out the PA system as he works at the gym - thinking he'd be doing a favour by saving them the cost.

Unfortunately, his phone automatically connected via Bluetooth and started playing the last thing he was watching on his phone instead of the music he had planned.

He wrote: "On the day everything was going fine, everyone was seated and went quiet for the groom to talk so someone turned the PA system on.

"This is where it all went horribly wrong... my phone automatically connected to the speaker and started playing what was on my phone last.

“This happened to be porn from the night before, porn sounds started playing from speaker in front of everyone including the brides and grooms families.”

He added that he reached into his pocket to silence his phone, and the groom laughed when he saw what had happened.

However, the man said that his girlfriend appears to be furious about the incident.

He wrote: "My girlfriend saw me get out my phone and press pause on it so she clearly knew that porn was coming from my phone.

"She didn't say anything at the time however I went home and now she isn't responding to any of my messages and I don't know what to do?

"Do I leave it for a few days or keep trying to get in touch with her?"

People offered the man advice for the awkward blunder, suggesting he give his girlfriend time to get over the embarrassment on her sister's special day.

Others comforted the man, with one saying: "In two years time they'll be telling this story and laughing."

Someone wrote that they are in fact a wedding DJ and plan to "use this story when people are on the fence about hiring me and why you shouldn't depend on your idiot a** friend".