JD is one smart horse. The ranch workers where he lives, decided to bake a cake complete with candles and a rousing rendition of the Happy Birthday song.

JD surprised everyone by blowing out the candles on his birthday cake at just the right time, sending everyone in attendance into laughter.

Either this was completely coincidental or this is one of the most brilliant horses alive. I'm going for the smart horse answer. I've seen a horse smart enough to talk on television so why not a horse that can blow out the candles on his birthday cake?