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TikToker Kate (@simonsays122) stitched another user's video about warning others not to 'dye your hair and then p*** in the shower'.
In her video, she said to the camera: "I literally did this. So the first time I was ever dyeing my hair - I was dyeing it red - and I got in the shower, I did all the stuff, but then I peed because I was like, 'I gotta pee!'
"And then I start like getting so dizzy and I'm seeing stars. I could not see, I could not function."
Kate then did an impression of what she would have looked like, re-enacting her stumbling around in the shower.
She continued to say she looked online to find out about what may have happened, explaining: "It said it creates mustard gas, which can blister your lungs and basically kill you."
Recalling what happened next, Kate said: "I'm having such a hard time breathing and I get out of the shower butt naked, and I go and I lay on the floor."
Again, she shows us what she would have looked like at the time, filming herself lying on the floor, gasping.
Kate continued: "I literally laid there for like 20 minutes, and then I got up and I, like, s*** a lot - sorry, TMI.
"I got right back in the shower and everything was fine, but I literally thought I was going to die.
"Like, my heart rate was so slow."
At the end of her video, she added: "So basically, don't do this."
The warning has featured in various TikTok videos, with other users saying they'd experienced similar problems.
In a video from a user called @goffgirl666, she speaks about how weeing in the shower while washing off hair dye can cause a chemical reaction making mustard gas.
However, she later made a TikTok video explaining she was just joking.
A report from the Metro also says we probably shouldn't feel too concerned by the issue, arguing it's 'certainly nothing to worry about day-to-day', with a spokesperson from Public Health England telling the outlet: "There is no evidence to suggest this is true."
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