I've actually witnessed this BS irl.
Keep in mind I was 14 at the time and he was 16 and were both pussys.
"Man , been doing so much on the bench press, and I'm doing 15 mins of bicep curls with 10kg's straight".
At the time i knew A little bit about training, probably more then most my age and was thinking "sigh, twat". So I asked
"How much do you squat?"
"WOW, 70kg? holy shit thats amazing man, how many times?"
Anyway 2 years have passed im 16 now and workout at a gym he does. Me and my bro were training our legs, we were squating.
I asked, dude you can squat 70kg,right?
"Yer, easy peasy"
"Go for it then"
What i saw got me angry, he literally just unlocked his knee's and then locked them.
"I was like, nice, cool"
Then i did it in proper form and he walked off
This story also happened with another of my friend who did quarter squats and classed them as FULL SQUATS!