I think I had more than one experience with the demonic.
There was a man here who was homeless. He would go from church to church and cause problems. One time, he took my stuff (which I had left in the pew as I did the Stations of the Cross). He took my missal and was going to rip it up when a sister took it out of his hands.
Another time, he came into church and vomited and fell asleep.
Another time, I went to another church which had the Blessed Sacrament. He came in and began spitting and spitting all over the place. He grabbed one of the books and said he’d sell it for a peso. He lifted his fist to hit someone. Then, he ran next door where they were saying mass. He caused went to the altar and started more problems over there.
One time, I saw this man, and suddenly, he hunched over, bending his elbows and his wrists (hands down with hands open, fingers down) in a position I’ve seen when people draw pictures of demons. He had a weird smile on his face.
People who knew of him said he’d sometimes strip down naked.
I realize he is also probably mentally ill, but he just did some things that made me wonder if he was possessed.