I don't know if you would call it a "WHOO HOO moment", but I too have noticed something about the months they decide to publish some of their new truths deceits. At least for me, it does seem to occur in about April/May or August/September. Well, for the most part...
Just off the top of my head, here are some examples:
-April 1st, 1979 - Jesus is NOT the mediator for all mankind.
-April 1st, 1972 - The WT declares that "it is easy to say that this group acts as a 'prophet' of God. It is another thing to prove it. The only way that this could be done is to review the record. What does it show?
-April 1st, 1920 - The WT declares that they would "not refuse to treat one as a brother because he did not believe the Society is the Lord's channel."
-April/May 1984 WT's - The WT declares in 4 issues that the Generation of 1914 wouldn't pass away before the end of this "system of things". Yeah, right. Another false prophecy.
-August 1st or 15th, 1974 - The WT declares that it's okay to treat D/F members nicer and that it's OK to talk to them.
-September 15th, 1981 - JW's shall NOT talk or even eat with D/F JW's.
-April 15th, 1988 - The WT declares how to treat D/F ones yet again.
OK, after putting together this list, I was wrong. For some reason I have a lot of April quotes in my head right now. The September article I mentioned above stands out for me because that's when they instituted their hardline approach towards D/F ones.
I don't really see a pattern. I'm sure anyone else here could declare that any other month shows other important WT declarations.