Then and than

Both were the same word in OE: thanne (thaenne, thonne) (spelled with a "thorn", but don't you worry about that). So now, whenever you invariably mess than up, just smile and say you're not going to conform to the vagaries of Enlightenment Era scholars and instead prefer the true English way of using conjunctive particles. Similarly, you could also say you're doing it in solidarity with the Dutch, who apparently only use "dan" for both, but it's probably best not to bring the Dutch into this.