Maybe there's an existing thread for this but I couldn't find it and I like to know that other people do dumb things so feel free to tell on yourself here as well. Here's my most recent dumbness:
My little wizard learned 414 late last night. I thought I'd go strut my stuff and use it to spell up some random person. Feeling good about my selfless generosity, I logged off to go to go to sleep. I didn't realize until this morning that 414 is not a group spell so I just ended up spelling myself up
Sorry random person!