First time I’ve had a customer throw something at me

Hello everyone, this is my first post here. Haven’t been in banking for super long, for about maybe 7 months or so. I work as a banker, and have had a great experience so far… until today. I had a gentlemen come in without an appointment that had questions about his credit card. I wasn’t busy, so no problem. He is screaming at me right off the bat. He had a large balance on his credit card, and is getting charged $200 in interest. Long story short, he doesn’t give me the time to say anything, throws his bill at me, and slams my door open and walks out…

Out of my 5 years of customer service, I have never had anyone throw something at me, and I’m shocked someone as old as my grandparents can act like that and think it’s okay. I just wanted to rant about this, that’s all! One day, I’ll get out of customer service and move to a back office role either in the bank, or outside the bank.