Have you ever walked in on someone masturbating?

I caught my wife having phone sex once. She had a monster black double headed dildo in her pussy and arse. She was hammering her clit as she told the guy on the phone what she wanted to do to him

Walked in on my Uncle jerking off to a pic he took of me

Of course.

Just someone who knew I was on the way.

Although in a past life my SIL was staying with my ex and I for a bit , so I would stroke with the door ajar as often as possible.

Years later she told me she watched a few times.

I have had people catch me jerking off many times growing up and while.in the military

Yes my daughter's boyfriend I stayed until he finished

Yes, that is why you knock ....

In 8th grade our basketball team had to wait for practice and we circle jerked. One of the guys was jerking me and a teacher walked in. I shot my load all over the floor. She smiled and when my cock stopped shooting, she said, “Be sure and clean up.”