I've never crashed a wedding. When I was a kid I of course used to crash parties. Crashing a wedding is difficult though because you have to have the suit and you have to have information in case someone catches you. You have to know at least some names and something.
My kid could get a bad X-ray and I could get a call from the doctor saying I have something growing in my bum and that would change my perspective on everything instantaneously on what is and what is not important.