Roxy, (the pic in my avatar), the dog I had before, used to make me laugh so hard when she'd chase moving reflections from jewelry and such. We called them *sparkles* and would occasionally get a mirror and make the *sparkles* dance around the walls and ceilings, causing Roxy great wonderment and joy.
Daisy, (the pics in my sig), who is my new puppy, makes me laugh the way she loves raw rutabaga chunks and catches them in her mouth. Also she makes me laugh when she appears to actually be watching a movie. I'm sure, I've yet to discover many more fun behaviors with this little one.