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If the mere thought of your mum and dad going at it like rabbits is utterly horrifying - of course, it is - actually seeing it in real life is a level of trauma that no child needs.
But it's one that Joseph Pena experienced when he decided to play a prank on his parents after returning home from the military. Watch below:
The 20-year-old, from Colorado, hadn't seen his parents in two years, as he had been completing his service in Germany.
So when he returned to his family home, he decided to give his rents Kaati and Richard a bit of a surprise, and pretended to be a burglar, storming into their bedroom.
As you can imagine, it did not go down well at all.
In footage shared online, Joseph can be seen sneaking upstairs to his parents' room before throwing the door open and shouting, 'This is a robbery!'
And while he expected to see them sleeping in their bed, Kaati and Richard were anything but.
According to the couple, they were 'talking', which is the word they used for sex when the kids were little.
Recalling the surprise, Kaati said: "We were surprised and beyond embarrassed.
"My husband and I were talking, which was our code word for sex when the kids were little, and we were in the moment when the door got kicked open.
"I screamed because I saw my son and of course realised he saw everything exposed."
She added: "We had no clue that our son Joseph was coming home on his R&R and he told his sister Josephine, the camera lady, that he wanted to surprise us.
"The online responses have been epic! The comments are on fire and most are roasting our son for not knocking. To this day it’s still being viewed, and comments are still pouring in.
"Our poor son was scarred during his R&R, and spent most of his time with his sister and his girlfriend."
After the encounter, Kaati revealed that Joseph 'avoided' visiting them during his leave, instead keeping in touch via text messages.
Kaati said: "We were okay with it because he needed to enjoy his R&R and not be scarred by what he saw.
"I’m sure he’s trying his best to erase the visual memory of the incident, but living with us will only remind him of how Eve and Adam conceived the whole world."
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