When you go into a public bathroom for the opposite gender on accident, but you have already started shitting so you can’t go back and go into the right restroom.
“Well Hank I was in a hurry and the restroom doors were poorly labeled. It’s unfortunate I pulled a HandsomeWilliam, now all the woman in there think I’m a pervert.”
Cause (someone) to have their perspective on Jews dramatically transformed, especially by introducing them to a new and disturbing understanding of the truenature of Jews.