Happy birthday! Well, since so many people refered the birth of a son/grandson/brother/etc and lottery... I'll go for the random thought....

You were eating toasted bread with butter on it and a loaf fell to the floor, with the buttered side up?

You saw a bear?

You decided that blowing 100$ on complete strangers is a good idea.

you discovered you were a brony.

You met someone of high importance, the President or the Prime Minister, perhaps?

Hmm, so I guess no one has figured it out yet.

You bought a game on GOG and it replaced your entire shelf with that game.

Or what about - you opened a crisp bag to find all that was in there was 2 crisps that had gone soft and huge block of Cheese and Onion flavor salt - happened to me once, prolly should have taken it back rather than giving myself a headache trying to actually munch on it...

You met someone who has the same name and birthday.

Happy Birthday btw :) And wow, this thread is 7 hours old and 11 pages long.

You just had a family reunion?

You got a puppy?

Has anyone guessed that you won a gigantic contest with fabulous prizes? If not, that's my best guess.

You won a trip to someplace exotic?

You flipped a coin and it landed on its edge?
Please drop us a clue or few :)

You saw a double rainbow and then proceeded to high five the planet for such an awesome birthday present.

You figured out a hack to GOG that allows you to download any game, purchased or otherwise?