Was out in the driveway yesterday, which is clear on the other side of house from where my bee yard is, when I heard the buzzing like iv'e never heard before! Looked in that direction and saw a cloud of bees! This was first swarm I personally have ever witnessed. Last year, both 2 hives I started swarmed about this same time of year, but was not home at the time. Anyway, I started realizing after watching them, that they were going back to the hive and clustering on the front of the hive. Eventually they were all back in. Meanwhile, I had ran and put on veil and lit smoker and grabbed a medium super with frames, and an inner cover with notch, and piece of plywood to go under it to block oval hole in inner cover, and this was going to be my bottom board, LOL, if I was lucky enough to spot queen and put her in. But since I didn't, I opened this hive, and added this medium super to hive. Was strange because I had just checked all 4 hives the day before and didn't think space was an issue.
Now everybody says swarms are usually gentle, and maybe is the case once clustered on a branch or whatever. But I'm here to tell you, me and my daughter was in front yard watching the bees in the air, not in the bee yard, and both of us were being harrassed by a rogue bee. Maybe a few were mad that the swarm decided to go back to the hive, I don't know.
Here's a link to some pics I took and posted on my facebook site. Happy Beekeeping!