... not to get bummed in the gob.
"Being the official safety inspector of orifices; I can indeed confirm that being bummed in the gob is a most dangerous act and a heinous crime to be sure."
"I was bummed in the gob as a child and look at me now!"
"Don't do it kids! I spent the last four years of my life avoiding a bum to the gob and look at me now!"