You want to be SURE about something in beekeeping?

With YOUR bees?

heheh..
All I can say is I have seen that behavior from hives with new queens, and they didn't Swarm, so I had to GUESS, that it was because of mating flights, much like the poor fellow in the vid I posted.
I can freely admit that every time I see it my heart skips a beat. I figure one day thats where my wife will find me.. laying in the grass when my heart doesnt restart.