The most astonishing thing to me about bumblebees is that they can fly at all. It's clear that they are not the most aerodynamically constructed creatures in nature but I guess they don't know that and they just buzz along, minding their own business and collecting pollen. Which leads me to my next point, they do mind their own business--they are not out to attack you, in fact, they are not, by nature, aggressive. They will not go on the defensive unless threatened so if you have one hovering around you, best not to start flailing your arms around. Instead, allow them the chance to smell that you are not a flower and they will go along their merry way. I'm out in my garden watering every day and my bumblebees fly all around me and I've not yet had an incident. I just let them be. (I can never resist a pun).
Bookshelf: Container Gardening Books