Saturday night I went to brew a 5 gallon batch of beer using the all-grain technique, which I've never tried before. I did my research on all-grain brewing, talked to a friend and had all of my equipment prepped and ready to go.
But one little mistake caused me to throw away the whole batch out of frustration!
Check out the photo below. When I prepped my mash tun, I set the metal screen on top of the silicone tube, instead of plugging the hose into the fitting. Setting the screen wrong let unfiltered grain clog up the tube and ruin my night.