I greatly enjoyed these two short videos of sea lions having fun in the surf off Santa Barbara Island in California last month. They were filmed by a documentary crew from Pacific Offshore Expeditions. The first video has a music soundtrack (which fits it very well), while the second (with more close-ups and slow-motion photography) is silent.
I can never understand those who try to deny that animals play, and have a sense of humor. If any critter was ever enjoying itself, those sea lions were!