My mom is a Southern lady who serves as my go-to etiquette guru, and sometimes she says things that surprise me. Most recently, she told me it was gauche to write thank you notes on stationery or notecards that say "Thank You" on the front. Which is funny to me, since every stationer sells these.
When I expressed my shock, she polled her Southern friends, who agreed it was gauche. The reason: since you are properly saying it inside, there is no need to say it on the cover. The saying of it on the cover is just for the lazy writer.
Well I certainly don't want to seem like a lazy writer. What do you guys think of this rule?