A friend of mine from the east coast wrote to straighten me out on bumble bees. He said that when he used to till his fields, he would occasionally disturb a bumble bee nest. The bumble bees would react to this intrusion by attacking and stinging.
So there you go, I do know someone who has gotten stung by bumble bees!
Rusty
I had them in the eves of the house. I was eating a sandwich on the porch and was stung repeatedly.