Stupidest thing I did happened 3 days ago, my most recent batch:
1. Put half my grain in, then rice hulls, then baked pumpkin; added strike water, stirred till hit mash temp (154), let sit 10 mins before realizing the other half of my grain was still sitting on the table
2. Added the other half of grain -> mash temp down to 149
3. Quickly boiled some water (amt. I didn't measure), added to tun -> only brought to 151
4. Quickly boiled some more water (again not measured but more than last time) -> way too much and way too hot -> mash temp to 165
5. 15 mins of constant stirring and feeling like an idiot, mash temp finally down to 156; figured that's fine
6. First running went well. batch sparge -> went to drain second runnings -> stuck sparge
7. Reached into tun to check clog -> scorched my arm
8. didn't end up sparging b/c of clog -> didn't hit target gravity (compensated a bit by decreasing volume though)
8. During ferment, also realized 7 degree difference between ambient air and fermenting beer temp -> explains the fruit esters and fusel alcohols in my beer; now using water bath
BUT, I'm actually glad all that went wrong b/c at least I learned from it