When I was a kid we had one of those metal swing sets with the plastic caps that disintegrate about a week after you put the set up. Unbeknownst to me, some bees set up a hive inside one of the open tubes.
When I'd mow, I'd have the mower right up against the swingset because we didn't have a weed whacker. As soon as the mower touched the set, I saw that same cloud emerge. I ran straight to the back door, opened it, and slammed it as fast as I could. Bees (or wasps, who knows) pelting the screen trying to get me.
My mower was a reclamation project my dad found and put back together. That's why it still self propelled when you let go of the bar. And now I see the mower is chugging along heading straight at my dad's garden. Belt or bee stings... Belt or bee stings...
I ran out the front door (since the bees were at the back door still) and got to the mower inches before it got the garden. Turned it off and ran back into the house.
I almost got the belt anyway when dad came home and saw there was a half mowed lawn. But once he saw the bees himself, I was OK.