My BW pull-up PR is also a mystery haha. I think the most Ive ever done in the gym was 16-17, with chalk and knerling grip. But then one day for my job I was around some kids at the playground and they wanted me to see how many pull-ups I could do, and I busted out 19 with a fatass swingset top rail as the grip and in a button down and slacks, and still felt like I had a few in the tank but was going to rip my shirt. That still haunts me, why can I never replicate that day in the gym
"The only 'ist' I am, is atheist"
- Neil DeGrasse Tyson