Apparently the honey bees consider the tomatoes to be theirs. They do not want to share.
(This is the top of my hand, so I know I didn't squeeze or grab it accidentally.)
(The good side of this is that I haven't been stung by a bee in years and years. My reaction was: Oh, will you get Off and I scraped it off. I know it will die, poor thing. I want some hives in the future, so good to know it didn't hurt that bad since I really couldn't remember.)