I've seen it a couple of times.....It's super rare though. One time I had the K J of hearts in a freeroll.......The flop came out 10h, Ah, Qd......I thought I had the royal flush......we both checked it.....the 2 of clubs came out on the turn so I did a small bet making it look like i was tryin to steal. The other Guy re-raises me all in (it was already a pretty big pot because there was some massive preflop betting going on).....No soon than I hit the call button I was like shit....That's the queen of diamonds and the other guy has pocket Queens! But the Queen of Hearts showed up on the river...lol, needless to say the other guy was pissed. It's the only time I've ever gotten a royal flush