Milestone?

For probably 6 months, Sam has been trying to do an armpit fart. He saw one of my brothers do it and has been obsessed ever since. Sam has always been very hard on himself, when he was 3 and couldn't hit a baseball with a regular sized bat, he sat on home plate and said "I'm bad at everything" I know, could it have broken my heart more? NO, no it could not. Anyway, I have no idea where this comes from because I am probably the most encouraging and positive person in the world, probably too encouraging...for example: I have felt really bad for him not being able to armpit fart, not because I really wanted him to do it, but because HE really wanted to be able to do it. The Armpit fart just seems like a right of passage for little boys, and I wanted him to be able to achieve it. Well, we've tried everything, I've even wiped my own spit underneath his armpit thinking that would help (It didn't). Then suddenly today...he did it. What surprised me more than him doing this finally, was how excited I was. You would think he had just learned algebra, I got up and started jumping around like a complete idiot. We were jumping around in a circle holding hands saying "armpit fart" over and over. What in the hell happened to me? I used to be a girl right? If someone came up to me tomorrow and asked me what my most exiting moment this week was and I was being honest, I would have to say: " My son figured out how to make a fart noise with his armpit."