Dear Uncle Ray,
I received your R.s.v.p. for our wedding today and I’m sorry you will not be able to attend. I also received the $20 bill you stuck in the envelope. Without a note of explanation, I can only assume that this is a wedding gift and hope you didn’t accidentally put your phone bill payment in the wrong envelope. Financial times are tough and I appreciate your kindness, and you’ll definitely get a thank you note from us.
Still, it’s kind of weird to put a $20 bill in your R.s.v.p. envelope. I’m just sayin’.