Some people are so bold that it is unbelievable! As usual, the train was packed with barely any standing room. One woman walks in, looks around for seats, then looks around for a good area to stand and lean back on, and reluctantly, ended up standing right next to my seat (I got lucky, someone seated in front of where I was standing exited at Rockridge, YES!). She was unhappy standing and holding on to the overhead safety bar because she had this annoyed look on her face.
The next thing I know, she leans her butt on the the side of my seat. To make matters worse, she quickly realized that was a comfortable position and decided to SIT her butt on topside of my seat cushion, completely touching my right shoulder. Her butt wasn't big but it was big enough that my poor right shoulder had to bear a little bit of the weight. I quickly looked at her and bumped her butt off with an abrupt shoulder shrug. She didn't feel the first "shrug" but with a bit more push, she certainly felt the second one as she quickly stood up.
Lucky for her, she quickly got a seat at MacArthur as 1/8 of the train exited.
Quite interesting though. All my years of taking BART, this was the first time someone actually "sat" on me.