Well, don't walk and knit when you're doing the gusset decreases on patterned socks.
I /so/ can't keep track of whether or not I'm on a decrease row at the same time as I keep track of what row of the 4-row (in Hedera's case) pattern I'm on. Hence, I remember the decrease on needle 1, get the pattern right on needle two, and forget the decrease on needle 3, and then don't realize what I've done for a row or two.
Tinkity tink tink tink, I'm back to where I was the other day. I'll redo it and hope to show you better tomorrow.