My grandmother sends me a birthday card with 20$ in it. Also inside the envelope is another envelope with a fresh stamp on it, and inside that envelope is a blank thank you card. For the first 10 seconds I was staring at the blank thank you card, I was thinking "my gosh, Grandma is really losing it" - then I figured it out. This is her way of saying "Now listen here, you ungrateful grandchild: When someone takes the time to send you a birthday card, you damn well better send a thank you card back. Now I've included one in this letter, already postmarked, so you have no excuse in the world not to send it." I really don't know if I should send her thank you card back to her or if I should go get my own and send it back. I don't know which one would be less of an insult to her. Do you guys send thank you cards for birthday cards?