A few nights ago I squirted Stephanie with one of Holden's bath toys and Holden laughed harder and longer than we have ever heard him laugh before. It was hysterical. A good knee slapping, body trembling, belly laugh is the only way to describe it.
Of course, we did not catch it on video. We tried to recreate the scene the next night on video and while the laugh doesn't quite compare to the one from the night before, its still a pretty good one. There is no better feeling than having your child happy and laughing.
My favorite part is around the 20 second mark.