I would not be able to refrain from laughing if I worked in ER and had a patient with a can of shaving cream up his butt. I’d probably ask, “Did you give any thought at all as to why you were doing this? Have you considered mental help?”
Trust me, laughing is the last thing on your mind. Dealing with these folks is not a lot of fun. And usually they want to tell you how it got there. I dont’ care and dont want to know. Trust me.