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.