For spells and rituals, I sometimes write them before hand, but most of the time I forget I was going to cast something. Then on the night it's like "Sh*t, I was going to cast a spell tonight!" Then I rush around getting a pencil and paper, and right what I think is right. Or sometimes I make it up on the spot.
_________________
There once was a small blue bird
Who sat in a big brown turd
He said, "Golly gosh me,
this is better than what's on TV,
our world has gone quite aburd."
-Me