Seeker, good post topic!
I also appreciate when I 'get back' the ability to laugh. It is a good indicator of how I am doing.
My cat makes me laugh. I just adopted him 2 months ago and he is a playful funny cat. Always carrying a toy around in his mouth, ready for me to stop what I am doing to play with him. I have to go to bed a half hour earlier now because we got into the habit of playing there so now he expects some play time!

He is a curious cat too, and my friend calls him 'slinky' because he hangs over the edge of the couch, then slips his whole body all the way over in a fluid motion....instead of just jumping down. Today he tried that and slipped right off the glass topped table where I have my computer and crashed, unplugging the computer and scaring himself in the process! Poor thing! but.. funny!
Irony makes me laugh. I live in Florida and have a picture of Denali National Park (Alaska) hanging in my living room.
Old Roseann shows make me laugh when I am feeling good; at other times they leave me completely flat.