I've had 6 K-high straight flushes over my years at home games or online. 2 of those in 7-stud, the other 4 in hold em.
One of those times I had the K-to-8 of clubs, a 6-card straight flush. I think that's cool, even though it doesn't count for anything extra.
I've never had a royal.
Sometimes it takes a crazy person to see the truth. If so, I'm a freaking lunatic.