When you're a grad student or a post-doc, you might be working on your main project and get a little idea about something. A connection between your work and a talk you just heard, something sticking out in your data that you didn't expect to, so you decide to explore it a little further--an extra western blot, a different angle of analysis. You would probably do this on your own, maybe not even mentioning it to your PI unless something interesting came out of it.
I am now fifteen months into PI-hood and overseeing a cadre of exceptionally adept people who largely don't need me around anymore. Moreover, I am burdened with tasks that mostly tether me to my desk. So when these little ideas occur to me, instead of quietly testing my theories on my own, I have no choice but to burst into the lab, Kramer-style, declaring "I JUST HAD AN IDEA!!!" I then explain my thoughts briefly, give them but the vaguest of information on what they should do to incorporate my brilliant plan into their projects, then retreat back into my office.
I'm pretty sure my grad students and tech think I'm totally bonkers, but I hope that they chalk it up to being a socially inept genius as opposed to, say, someone who simply hasn't the wherewithal to write things down and bring them up at a more appropriate time.