Suffice it to say, the return address reads:
Church of Scientology
Flag Service Organization
PO Box 31751
Tampa, FL 33631-3751, U.S.A.
and there's a happy fun picture of L. Ron himself on the other side, with the following quote:
"'If at a breath I could wish the whole universe right as you too may have dreamed, it would be wonderful. But it takes a lot more than breaths or wishes to accomplish that and it requires that you also do your part in it if you and those dear to you are going to make it fully.' --LRH from LRH ED 348 INT of 13 March 1983"
This amuses me much more than it probably should.