Isn't a proper belly laugh just the best? It makes you feel brilliant. All those endorphins, plus of course whatever tickled your fancy in the first place.
Even better is one of those laughing fits that just won't stop. Where you finally catch your breath, chest heaving and sides aching, only to make eye contact with your partner in laughter and dissolve into fits of giggles again. I had one such laughter attack last night, honestly I thought I might never stop. It was one of those "you had to be there" moments, but honestly it was just brilliant, I'm still glowing from the laughter now.