Ha ha, hee hee! There's always something funny about seeing someone fall on their butt - so long as they don't get hurt in the fall, of course. And the only thing Mickelson hurt with this slip is his pride.
And, indirectly, his score, since he was walking on those slippery rocks in spikes in search of his golf ball (didn't find it) on the 18th hole at Pebble Beach. And that is not a place a golfer wants to be on the 18th hole at Pebble Beach.
Mickelson wound up making an 8 on the hole. Which, coincidentally, is the same score he received from the Russian judge for his dismount.