I have. First time too. I didn't go down on one knee though. I have poor balance and would probably end up falling over.
This is the first time I've ever been face to face with my current bishop. Tonight at Mass was Confirmation for the kids in our parish, the neighboring parish and the local Newman Center.
After His Excellency, three priests and one deacon filed out with a troupe of altar servers surrounding them, the congregation kept on singing. My row had already emptied out at Communion and singing isn't for me anymore, so I ducked out and on my way by the bishop, I reached out to shake his hand and gave his ring a quick kiss.