Playing Poker for over twenty years I have seen a few, and I have had a few myself, once in an on-line game I was struggling and down to about 15 BB I pushed all-in pre-flop with a K/10 suited and hit the Royal on the flop, I had 2 callers who had more chips than me and I sat there laughing at them battling it out knowing I had the "Nuts" already.
Another time in a Live cash game I played Q/10 suited from the BB and hit a flush on the flop of K,J,2, but I was aware my opponent who kept betting into me could have had the Ace in his hand, but when the Ace came on the River giving me the Royal Flush I made a big River bet saying that had given me my straight, he called with a 9/7 suited flush and nearly threw the table over when I showed a Straight Flush. But I wasn't lying, I did make a straight.
When the fun Stops, STOP!