I unfortunately watched a friend roll his 206 over, on a clear bright sunny day. I spoke with him after the accident. The helicopter was on a slight slope, he was new to the 206, he lifted collective, he felt the left skid lift, assumed, the right skid had come up also. He applied right cyclic, pivoted on the right skid, and over she went.
He said from the time he moved the cyclic to the time he realized he was laying on his side was so fast!
A real shame, he was OK, a little shaken, and now sans helicopter
Fly safe...