My experience was the partying. He seemed to have boundless energy for it and it was infectious.
I remember arriving at a conference with serious jet lag and just wanting to sleep. I grabbed dinner with a few of the other speakers and Bob's energy was enough to turn dinner into drinks and drinks into skipping the whole night's sleep.
I vividly remember being sucked into his craziness more than a few times in my formative years!
A fun, welcoming guy and an incredible technologist.