TIFU by joking with my nephew and ultimately embarrassing his mom at the doctor's office.

It was the 4th of July, my sister invited me over to her house for some hotdogs. She has 4 kids, 3 boys and 1 girl, the boys are all gamers, hours every day...gaming. I'm helping prepare plates for the lazy boys when my youngest nephew stood up, massaged his lower back and groaned like an old man. He complained about his lower back being sore and that he needed a massage. I'm nearing my 40's so I have that millennial humor that sometimes goes over their heads so I threw some Half-Baked shit at him,

'What you probably need is a backiotomy.'

He had no clue what I said, just said 'What?'

'What...you...need...is...a backiotomy, I remember being your age and having lower back issues, doctor said I need a backiotomy'.

And that was that, saw the joke go over his head and nothing else was said about it that day.

Friday, at the end of the week, I had 2 missed calls from my sister. I call her back and boy, she sounds mad.

'WHAT THE HELL DID YOU TELL C?!'

'About what?'

'ABOUT HIS BACK?'

'Oh shit, I don't know, why? what's up?'

'He told me he had some problem with his back and that you had mentioned some condition that worried him so I scheduled an appointment. His appointment was this morning and when C mentioned what he thought was wrong with him to the doctor, the doctor looked at us like we were STUPID!'

'Oh shit, what was it that C told the doctor?'

'Some stupid backiotomy shit'

'WHAT THE FUCK! THAT WAS A JOKE, it's from Half-Baked...damn C'

'Yeah, I know. It's from your stupid stoner movies, the doctor made that damn clear.'

'So what's wrong with C?'

'NOTHING, he's got to exercise more'

We got a laugh out of it and will continue to laugh about it some more, no one was really mad, she was more upset at a 'wasted' copay for the doctor visit so I owe her lunch. My nephews, 15 & two 18 year olds, I love them but they can sometimes be naively dumb.

TL;DR: Nephew has back pain, tell him a late 90's stoner flick joke that he takes serious, schedules a doctor appointment and finds out the condition don't exist.