I think my worst brew day was:
A friend and I were brewing a double batch. Black IPA in one kettle and porter in the other. The porter was boiling away while we were heating the water and steeping our grains for the IPA. As we started preparing to rinse our grains I noticed the porter had stopped boiling.... D*MN! Out of propane! To the BBQ! Stole that propane tank quickly and got the porter boiling again. Began rinsing the grains for the IPA very slowly when it dawned on me. I had been turning up the gas line to the porter because the flame was getting low, not realizing that the tank was getting empty. Now with a nice full tank the wort was MEGA BOILING!!! Sure enough, right as I realize this, boil over. As I go to move out of the way I drop some of the grains on the floor, and the porter starts to make my garage floor sticky. Gently set the grains down, got the porter back under control, and proceeded to finish rinsing the grains for the IPA.
Needless to say it was a pretty hectic 5 minutes.