I have been brewing for a little over four years now and have had no major mishaps. I believe the universe was saving it all up for today.
Let me start off by saying I used to have a cheap ikea desk that had a heavy glass top. I long ago got rid of the desk but turned the glass top into a nice brew table on wheels. It has been great for the last year or so. Well today started off with a stuck mash (my first one). I tried to solve it by blowing in the runoff tube. Well my mash tun was very full at this point and the hot mash overflowed out the top when I blew. Stupid me I thought. Well it unstuck the mash, but as I was cleaning up the table I realized that some hot mash was under the glass. So I took the glass off the top and when I went to set it on my cold concrete garage floor the glass blew up! Yes blew up was a great way to say it. It exploded into thousands of little pieces like a car window. It cut me all over my arms and hands. I am guessing the heat + cold caused it to shatter.
It was easily my worst brew day. I am someone venting here, but I think it would be fun now to hear someone else's worst brew day (especially if it was worse than this one). Might make me feel a little better.