For me, connecting my 2 BH series, a.k.a. series. Don't know why such the block there, but I remember being left on the beam while everybody else left to go home. Was the first to get my BH on beam, last to get my series. My parents even pretended to leave and come back later one summer practice. Granted that was back in the mid 80's and I was... hmmm I'm a parent of an 8 yr old now, you do the math. Let's say it was a LONG time ago and I was young.