I am the smartest guy in the room!
I know this because we learn from our mistakes, and boy have I made a lot of mistakes. Not only that, but I’ve also made several mistakes more than once! That makes me extra smart!
My most recent (repeated) mistake was ignoring a funny sound when I connected the liquid disconnect to a new keg of Munich Helles. I heard a hissing sound, so I pulled the disconnect off and re-seated it. Still hissing, so I repeated the process and decided that should solve the problem.
Five gallons of excellent Munich Helles went into the bottom of the freezer and out onto the floor!
So, lesson learned (again - last time it was five gallons of Vienna): if something doesn’t sound right, FIX IT! Just reach in the drawer and install one of the half-dozen new o-rings waiting there!