Not 20 min. after I was discussing this topic with some guys at a biker hangout over lunch, it happened to me. Luckily, I was wearing full gear and had my visor down.
I was doing about 60 mph in high winds on N. Scottsdale Rd. when suddenly it felt and sounded like someone had thrown a shovelful of gravel at my face. I knew what it was and and there was nothing I could do. I tried to stay frozen, so I'd not rub any of the bees I was sure were in my collar. A mile later I was able to pull over in a parking lot. I peeled everything off and there were several of live bees still crawling on me. But not one sting! Too bad for all those guys behind me on Harleys, wearing t-shirts and no helmets.